IS-Reail: BAPI_MATERIAL_MAINTAINDATA_RT

Hello,

I am trying ot create a new article (material) by using BAPI_MATERIAL_MAINTAINDATA_RT. Is that the right BAPI to do this?

The material get's created, but if I try to change it in MM42 I get the following error message:

Message no. MH084:

Assignment of article to merch. catgry missing in classification system

How can I resolve this error? The customizuing seams to be ok; create an article in MM41 works fine.

Thanks,

Manuel