vendor is not credited in MIRO

HI

M executive MIRO through the reference of MIGO, when i simulate the MIRO the system shows the debit amout with respective gl account but it shows the credit part as Zero value it shows only vedor name.

Exmp:

GR/IR Clearing ac DR 100.00

To Vendor(Name) 0.00

Thnaks

Srikant