POS inbound Price calculation

Hi SDN Guys,

I need to do price calculation for the weighted artivles EAN starting with 21*.

As per my knowledge the sap does some calculation ;ie weight /sap standard price.

but we need to conisder the Weight/SAP standardprice(per plant) { I think we need to fetch some price from some table here and divide }

I am trying to find out user exit for this.

IDCO type used for POS inbound WPUBON01,

message type WPUB

Inbound FM to post the data: IDOC_INPUT_POS_SALES_DOCUMENTS

please help me to find out the user exit and use custom calculation

regards,

Nazeer