Cause:

This issue appears if Same Party No. mentioned in multiple bills.

If Duplicate Number error appears at the time of internal audit, then this issue can be easily resolve in Marg Software.

In order to resolve the error of 'Duplicate Number', the user needs to follow the below steps:

• Go to Gst > Internal Audit > GST Return Errors.

• A 'Transaction Mismatch' window will appear.

• Enter Date Range and press 'Enter' key on it.

• A 'Transaction Mismatch As On Date' window will appear.

• Press 'Enter' key on credit note which is showing duplicate number error . 

Fig 1. View of party no. mention in CN000003  is '123'.

Fig 2. View of party no. mention in 'CN000002'  is '123'.

• User needs to change party no. of any one credit note from both the notes. 

• Suppose user change party No. of 'CN00003'  to '221'.

• Now press 'End' key to save bill.

• Click on 'Save in Bill/CR/DR Note'.

• Click on 'Yes' to Save Changes.

 After following the above steps, the duplicate number error will get resolved.