Can't remove profit center

Hi!

I use SAP B1 9.0 PL04, DB is empty. I import profit center by DTW with 4 dimension. Dimension 1 some profit code can't remove SAP shows error:

"Cannot remove a cost center used in transactions   [Message 80311-14]" I already check, no any transaction link to profit code. I check miss some table? why I can't remove profit center code?

Regards,

Hong Bich