SAP Message AH633 - External price &1 price cat. &2 price level &3: incorrect history table

Diagnosis
During determination of the external price via the user exitEXIT_SAPLEA91_001 (for example: EBL prices), the history table EPREIHwas not returned correctly.

System Response
Billing is canceled because price determination is not possible.

Procedure
Examine the user exit and contact SAP in order to correct it.