fix Mandator being set after applying functions that rely on it

MultiTool.Shared/Documents/DocumentLoader.vb

@@ -246,6 +246,9 @@ Namespace Documents
             If oMandator Is Nothing Then
                 Logger.Warn("Mandator not found for File [{0}]", pDocument.File.Name)
             Else
+                ' Set mandator befor applying any functions that depend on a valid mandator
+                pDocument.Mandator = oMandator
+
                 pDocument = ApplyDefinedItemFunctionsForImport(pDocument, oMandator, pTemplate)
                 pDocument = ApplyDynamicItemFunctionsForImport(pDocument, oMandator)
 
@@ -253,7 +256,6 @@ Namespace Documents
                 pDocument = Await MaybeApplyPriceFunctions(pDocument, oMandator, pTemplate)
             End If
 
-            pDocument.Mandator = oMandator
             Return pDocument
         End Function
 
@@ -312,11 +314,11 @@ Namespace Documents
                     Dim oFunctionParams = oColumn.Config.FunctionParams
                     Dim oParamsDict = ParseFunctionParamsAsDict(oFunctionParams)
 
-                    If oFunctionName = "GLN" Then
+                    If oFunctionName = Constants.FUNCTION_GLN Then
                         SetAccountByGLN(oRow, pMandator, oField.Key, Nothing, oParamsDict)
                     End If
 
-                    If oFunctionName = "EAN" Then
+                    If oFunctionName = Constants.FUNCTION_EAN Then
                         SetArticleByEAN(oRow, pMandator, oField.Key)
                     End If