Foreign Trade data in Invoice

Hello SAP Experts,

We are having many Invoices failing to create Accounting documents due to "Missing Foreign Trade data".

This issue have arised as they have Materials which are service materials and these service materials are not meant to have Export data.

Do we have any setting where we can make the "Foreign trade data " as exempt for these service materials and/or the Invoice do not have the Incompletion log  for missing FT data.

Thanks in advance for your answers.

Umesh Karane