fix: JsonPath uses original JSON keys, export value MaxOccurs must be 0

- Import mapping JsonPath must use original JSON key path (not ExposedName)
  for both object and value elements. ExposedName is a display name that
  goes in the ExposedName field, not in JsonPath.
- Export value element MaxOccurs changed from 1 to 0 to match JSON
  structure elements created by our snippet builder.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ako

mdl/executor/cmd_import_mappings.go

@@ -287,17 +287,14 @@ func buildImportMappingElementModel(moduleName string, def *ast.ImportMappingEle
 			}
 			elem.JsonPath = jsonPath
 		} else {
-			// Look up by original JSON key, then use ExposedName for the mapping's JsonPath
+			// Look up by original JSON key — JsonPath always uses original key
 			lookupPath := parentPath + "|" + def.JsonName
+			jsonPath = lookupPath
 			if info, ok := jsElements[lookupPath]; ok {
 				elem.ExposedName = info.ExposedName
-				jsonPath = parentPath + "|" + info.ExposedName
 				if info.ElementType == "Array" {
 					elem.Kind = "Array"
-					jsonPath = lookupPath // array container keeps original path
 				}
-			} else {
-				jsonPath = lookupPath
 			}
 			elem.JsonPath = jsonPath
 			// Array children use the item path for recursion
@@ -321,12 +318,11 @@ func buildImportMappingElementModel(moduleName string, def *ast.ImportMappingEle
 		}
 		elem.Attribute = attr
 
-		// Compute JsonPath and align ExposedName with JSON structure
-		// Look up by original JSON key path, then use ExposedName for the mapping's JsonPath
+		// Compute JsonPath (always original key) and align ExposedName with JSON structure
 		lookupPath := parentPath + "|" + def.JsonName
 		if info, ok := jsElements[lookupPath]; ok {
 			elem.ExposedName = info.ExposedName
-			elem.JsonPath = parentPath + "|" + info.ExposedName
+			elem.JsonPath = lookupPath
 		} else {
 			elem.JsonPath = lookupPath
 		}

sdk/mpr/writer_export_mapping.go

@@ -165,7 +165,7 @@ func serializeExportValueElement(id string, elem *model.ExportMappingElement, pa
 		"XmlPath":          "",
 		"Type":             dataType,
 		"MinOccurs":        int32(0),
-		"MaxOccurs":        int32(1),
+		"MaxOccurs":        int32(0),
 		"Nillable":         true,
 		"IsDefaultType":    false,
 		"ElementType":      "Value",