GL Account for Spl GL Indicator 'A'

Hi,

The users are trying to enter the downpayment in a Vendor's Account using the Spl GL Indicator 'A'. However, the system gives the error message -

"No special GL Account defined for acct type K sp. G/L Ind. A recon acct 486000".

To resolve the issue, the message displayed says - In system configuration enter a special GL account corresponding to reconciliation account 486000 for account type K and special G/L Indicator A.

How to maintain the GL account for Spl GL Indicator A and thru which T Code?

Your help would be highly appreciated.

Thanks in advance.