/TDAG/CPM_REPORT007 error in Compliance Status Report

Hello SAP Guru's,

I receive the following error message when I start the Compliance Status Report (/TDAG/CPR03) on a material:

Unit of measure M with dimension LENGTH is invalid for specification 000000001157.

Message no./TDAG/CPM_REPORT007

I guess something is missing in the customizing. But do you have an idea what is missing? and where can I define it?

Thanks in advance for your help.

Rudy