FCH5 cheque number field is not getting updated in BDC

Hi,

We are processing F-53 payment through BDC for our client. We are updating cheque number in assignment field. After posting the payment document we need to update cheque number immediately with FCH5.

But when we try to update cheque number field in FCH5 through BDC the system does not update the cheque number.

Could you please suggest how can we update cheque number filed throuhh BDC in FCH5? Urgent help regarding this will be appreciated.

Thanks and Regards,

Dipti