HI Srikanth,
The GL you are trying to assign to the Account symbol 5.3.0 is a Balance Sheet GL. 5.3.0 is intended only for PnL and hence the error.
As a standard, 5.3.0 is used of interest related flows which are posted to PnL accounts. In case you are posting a different flow, either create a new account symbol or use the correct PnL GL. You can also change the posting category of 5.3.0 but this might cause a different error if the same account symbol is used for some other flow too.
regards,
Nikhil