How can i restrict to post TDS entris while doing MIGO??

Hi Experts,

Wishes for the day.

We have some vendors both providing service and goods.so TDS codes are assigned in the vendor master record.Whn MM people doing MIGO for the PO,for that kind of vendors then TDS is getting calculated which should not be the case.As TDS entris shud be passed from the FI sides.

Plz suggest me,where can i restrict the MM users to pass tds entries??

take it as high priority and guide.

Regards,

Sumeya