======4.5. Production ======
==== 4.5.1. Workflow AfterQuantity problem ====
**Issue** \\
When producing, after //The items are produced// screen you get this error message:

''Parameter 'System.Collections.ObjectModel.Collection`1[System.String] ListOfSerialNumbers' is not known or multiples found in 'WorkflowScript_AfterQuantityProducedHookScript' ''

**Solution** \\
On the [[implementation:wms:workflows|Workflows tab]] of the Organizational Structre, select the AfterQuantityProducedHookScript. Click on the ’Edit script’ button. 

{{ :support:supportguidev2:pdmxrelated:correctingworkflow1.png |}}

On the opening Workflow script editor screen click on the ’Empty script’ button then validate the script by clicking on the ’Validate’ button. Then click OK to save the changes. 

{{ :support:supportguidev2:pdmxrelated:worflowscripteditor.png |}}