Insufficient Authorization..... With holding tax...

Hello Xperts,

I have scenario with payment card and a business flow is like customer is deducting with-holding tax and paying cheque of the net amount minus with-holding tax. In my Sales Order, I can only take the authorization of the amount customer is paying by cheque. For example 460 (total authorization) out of 500(total document amount). Now when I am trying to post the Billing Document to Accounting, system says Insufficient authorization.

What can be done in this scenario? Quick response will be appreciated.

Thanks a lot in advance.

Regards,

hp