[DATA_CONVERSION_NOT_VALID] Cannot convert value Not Passed to type String for required input

Hi ,

I have created an orch. where I am passing inputs (alphanumeric) to cancel a sales order line,

sometimes the orch is running correctly and cancel the lines but sometimes the status is getting updated to 980-999 but Qty is not getting cancelled also the cancel date not getting updated in the header; while checking in sales detail ledger I do see the cancel dates updated the shipped Qty is also not updated to 0 and the Qty not moved to cancelled Qty.

While checking in P980060 I see below error for the same dates when the order was cancelled .

[DATA_CONVERSION_NOT_VALID] Cannot convert value Not Passed to type String for required input Production Number.