Region of Origin ( in case of COO - DE)

Hello,

I'm configuring Customs export process for Germany.

My Question: The Field CUROO ( Region of Origin) becomes mandatory and shows up under in-completion log only when the Country of Origin is DE. How can I make this field optional?

There is no field for CUROO maintained under incompleteness procedure. I have checked under function group ( /SAPSLL/INCOMP_CHECK_DE ) but I am not able to pin point where exactly this check is happening.

Communication Messages in the document: M0910

Appreciate any help on this regard.

Thanks

Pradeep