Send MATMAS and CLFMAS Idoc with custom message type

Dear All

I have the following problem.

I want to send the MATMAS and CLFMAS idos together with BD10. For both I have a custom message type.

The MATMAS has the correct message type but the CLFMAS is sent with the standard CLFMAS message type and not with my custom message type.

Does anyone know how I can trigger both idocs with my custom message type?

Thank you for your help.