SAP Message /BEV2/EDMESS1212 - Movement category &1 is still assigned to movement types

Diagnosis
The movement category is still assigned tomovement types.

System Response
Deleting the movement category is denied.

Procedure
Make sure the movement category may be erased. At first, delete theassignments movement category for movementtype and movement category for costcenter/> of the movement category in the Customizing; then delete theassignment of the movement category to tax type.