Set Types not in IDOC

Dear Experts,

Currently I am working on an interface between CRM 6.0 and XI to deliver product specific information, including customer fields.

I am using the BDOC type PRODUCT_MAT.

The customer fields have been implemented through set types in transaction comm_attrset. For each set type an API append was created successfully through function u201CSet types/attributesu201D > u201CTransportu201D > u201CSet Typeu201D.

The set types are available in the API structure of the BDOC PRODUCT_MAT (structure COMT_PROD_MATERIAL_BDOC_TAB). But the set types are not available in the generated IDOC (I use the function module CRMXIF_PRODUCT_MATERIAL_SAVE to generate the IDOC...).

Has anybody of you an idea why the set types are not in the IDOC / how to get the set types into the IDOC?

Thanks in advance,

Alex