Calculation view

our project we have been asked to  create only calculation views. Hence i am in the process of developing them.

I have situation where, i need to join the projection of Join( vbak,vbkd) to M_TIMEDIMENION.

Projection,ERDAT = Projection (Date_sap){ M-TIME_DIMENSION) suing inner join

when i check for  a particular VBELN,

for ERDAT= 20150812 , there are multiple( 8 rows) for the same date inM_TIMEDIMENION.

Due to the AMOUNT from VBAK is getting aggregated.(170* 8) but the value should be 170.

How to resolve.

Thanks& Regards

Sree