How to delta extract table mbew to BW 7.0.1

Hi gurus, can you help me. I have tried to create a delta extract of the table MBEW, but has this table has relationship with another table, i create a view with these field

BWKEY, MATNR, VERPR, STPRS, PEINH, VMVER, VJVER

but the problema i have been tested for modification of material and cost to bring me the information delta but this does not work

some body now how to do i.

thanks....