diff --git a/src/openlmis-adjustments/adjustments-modal.controller.js b/src/openlmis-adjustments/adjustments-modal.controller.js
index 34a2220a..c37ef66c 100644
--- a/src/openlmis-adjustments/adjustments-modal.controller.js
+++ b/src/openlmis-adjustments/adjustments-modal.controller.js
@@ -31,12 +31,13 @@
     AdjustmentsModalController.$inject = [
         '$filter', '$q', 'modalDeferred', 'title', 'message', 'isDisabled', 'adjustments',
         'reasons', 'summaries', 'preSave', 'preCancel', 'filterReasons', 'showInDoses', 'lineItem',
-        'quantityUnitCalculateService'
+        'quantityUnitCalculateService', 'alertService'
     ];
 
     function AdjustmentsModalController($filter, $q, modalDeferred, title, message, isDisabled,
                                         adjustments, reasons, summaries, preSave, preCancel,
-                                        filterReasons, showInDoses, lineItem, quantityUnitCalculateService) {
+                                        filterReasons, showInDoses, lineItem, quantityUnitCalculateService,
+                                        alertService) {
 
         var vm = this;
 
@@ -45,6 +46,7 @@
         vm.removeAdjustment = removeAdjustment;
         vm.cancel = cancel;
         vm.save = save;
+        vm.hasInvalidAdjustments = hasInvalidAdjustments;
 
         /**
          * @ngdoc property
@@ -180,6 +182,11 @@
          * Adds adjustment to line item.
          */
         function addAdjustment() {
+            if (vm.newAdjustment && !hasValidQuantity(vm.newAdjustment)) {
+                alertService.error('openlmisAdjustments.quantityGreaterThanZero');
+                return $q.when();
+            }
+
             vm.adjustments.push(vm.newAdjustment);
 
             vm.newAdjustment = undefined;
@@ -223,6 +230,11 @@
          * back to the modal without applying any changes;
          */
         function save() {
+            if (hasInvalidAdjustments()) {
+                alertService.error('openlmisAdjustments.quantityGreaterThanZero');
+                return;
+            }
+
             if (preSave) {
                 preSave(vm.adjustments)
                     .then(function() {
@@ -250,6 +262,22 @@
                 modalDeferred.reject();
             }
         }
+
+        function hasInvalidAdjustments() {
+            return (vm.adjustments || []).some(function(adjustment) {
+                return !hasValidQuantity(adjustment);
+            });
+        }
+
+        function hasValidQuantity(adjustment) {
+            return adjustment !== undefined
+                && adjustment !== null
+                && adjustment.quantity !== undefined
+                && adjustment.quantity !== null
+                && adjustment.quantity !== ''
+                && !isNaN(adjustment.quantity)
+                && Number(adjustment.quantity) > 0;
+        }
     }
 
 })();
diff --git a/src/openlmis-adjustments/adjustments-modal.controller.spec.js b/src/openlmis-adjustments/adjustments-modal.controller.spec.js
index c16e5bfe..8a65ff56 100644
--- a/src/openlmis-adjustments/adjustments-modal.controller.spec.js
+++ b/src/openlmis-adjustments/adjustments-modal.controller.spec.js
@@ -22,6 +22,7 @@ describe('AdjustmentsModalController', function() {
             this.$q = $injector.get('$q');
             this.$rootScope = $injector.get('$rootScope');
             this.$controller = $injector.get('$controller');
+            this.alertService = $injector.get('alertService');
         });
 
         this.modalDeferred = this.$q.defer();
@@ -67,6 +68,7 @@ describe('AdjustmentsModalController', function() {
 
         spyOn(this.modalDeferred, 'resolve');
         spyOn(this.modalDeferred, 'reject');
+        spyOn(this.alertService, 'error');
 
         this.initController = initController;
     });
@@ -191,6 +193,52 @@ describe('AdjustmentsModalController', function() {
             expect(this.filterReasons).toHaveBeenCalledWith(this.vm.adjustments);
         });
 
+        it('should not add adjustment and should show error when quantity is zero', function() {
+            this.vm.newAdjustment = {
+                reason: this.vm.reasons[0],
+                quantity: 0
+            };
+
+            this.vm.addAdjustment();
+
+            expect(this.vm.adjustments.length).toBe(2);
+            expect(this.alertService.error)
+                .toHaveBeenCalledWith('openlmisAdjustments.quantityGreaterThanZero');
+        });
+
+        it('should not add adjustment and should show error when quantity is empty', function() {
+            this.vm.newAdjustment = {
+                reason: this.vm.reasons[0],
+                quantity: ''
+            };
+
+            this.vm.addAdjustment();
+
+            expect(this.vm.adjustments.length).toBe(2);
+            expect(this.alertService.error)
+                .toHaveBeenCalledWith('openlmisAdjustments.quantityGreaterThanZero');
+        });
+
+        it('should not add adjustment and should show error when quantity is negative', function() {
+            this.vm.newAdjustment = {
+                reason: this.vm.reasons[0],
+                quantity: -5
+            };
+
+            this.vm.addAdjustment();
+
+            expect(this.vm.adjustments.length).toBe(2);
+            expect(this.alertService.error)
+                .toHaveBeenCalledWith('openlmisAdjustments.quantityGreaterThanZero');
+        });
+
+        it('should not show error when quantity is greater than zero', function() {
+            this.vm.addAdjustment();
+
+            expect(this.vm.adjustments.length).toBe(3);
+            expect(this.alertService.error).not.toHaveBeenCalled();
+        });
+
     });
 
     describe('removeAdjustment', function() {
@@ -297,6 +345,33 @@ describe('AdjustmentsModalController', function() {
             expect(this.modalDeferred.resolve).not.toHaveBeenCalled();
         });
 
+        it('should not resolve modalDeferred and should show error if any adjustment has invalid quantity',
+            function() {
+                this.adjustments = [{
+                    reason: this.reasons[0],
+                    quantity: 0
+                }];
+
+                this.initController();
+                this.vm.$onInit();
+
+                this.vm.save();
+
+                expect(this.modalDeferred.resolve).not.toHaveBeenCalled();
+                expect(this.alertService.error)
+                    .toHaveBeenCalledWith('openlmisAdjustments.quantityGreaterThanZero');
+            });
+
+        it('should not show error if all adjustments have valid quantities', function() {
+            this.initController();
+            this.vm.$onInit();
+
+            this.vm.save();
+
+            expect(this.alertService.error).not.toHaveBeenCalled();
+            expect(this.modalDeferred.resolve).toHaveBeenCalledWith(this.vm.adjustments);
+        });
+
     });
 
     describe('cancel', function() {
diff --git a/src/openlmis-adjustments/messages_en.json b/src/openlmis-adjustments/messages_en.json
index 5649fa3b..d139fbff 100644
--- a/src/openlmis-adjustments/messages_en.json
+++ b/src/openlmis-adjustments/messages_en.json
@@ -11,5 +11,6 @@
     "openlmisAdjustments.total": "Total",
     "openlmisAdjustments.update": "Update",
     "openlmisAdjustments.actions": "Actions",
-    "openlmisAdjustments.close": "Close"
+    "openlmisAdjustments.close": "Close",
+    "openlmisAdjustments.quantityGreaterThanZero": "Quantity must be greater than 0"
 }