User exit EXIT_SAPLV54B_002 is not called

In SAP ABAP function module SD_SCD_PRICING_PREPARE is called when creating a shipment cost doc by tcode VI01.

There is a user exit EXIT_SAPLV54B_002 which should be used to include additional fields in pricing.

The exit is activated by activating the include ZXV54U03 and writing the required logic. However, I placed a break point in the include to check if the program will call the exit but it does not.

With the break point in include ZXV54U03, the system should have stopped when creating a shipment cost document via VI01 but this doesn't happen. Please advice.

thanks all exit needed activation through SMOD & CMOD