WMTOCO SAP L3818 Material withdrawal and material shipment must be confirmed separately

Hi SAP guys,

I have a little problem with my incoming IDOCs.

I acitvated to confirm the withdrawal and material shipment sperate.

If I confirm the TO with LT12, i will get a warning and I can confirm this warning with return and confirm the TO

But if my subsystem will send a IDOC to confirm the TO goes into an error and can´t confirm.

How can I fix this problem?

thanks for every reply