Field Cost ctr is a required field for G/L account

Hello,

When posting an SD invoice I get the following message:

Field Cost ctr is a required field for G/L account xxxx xxxxx

No FI posting could be made due to the reported error.

The G/L account used has a field status group in which cost center is a required field. In OKB9 a cost center is maintained for the corresponding cost element, but I still get this error message.

We really need a cost center entry when posting to this G/L account, so changing the field status group isn't a solution.

Does anyone know how to solve this?