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The field Assessable Amount (Total Amount – Discount) must match the regular expression ^\d+.?\d{0,2}$. 

Cause

This error occurs if the discount ledger is configured under the Sales Account with:

• Type of Ledger as Discount.
• GST applicability enabled.

Resolution

1. Press Alt+G (Go To) > e-Invoice > press Enter.
2. In the e-Invoice report, select Rejected by e-Invoice System and press Enter.
3. Drill down to the transaction with reason for rejection as the field Assessable value must be a positive value.
   
4. Update the discount ledger.
   1. Select the discount ledger and press Ctrl+Enter to open it in the alteration mode.
   2. Under: Select Indirect Expenses from the List of Groups.
   3. Type of Ledger: Not Applicable.
   4. Include in Assessable Value calculation for: GST.
      1. Appropriate to: Goods.
      2. Method of Calculation: Based on Value.
   5. Press Ctrl+A to save the ledger.
      
5. In the e-Invoice – Voucher Register, drill down to the transaction and press Ctrl+A to save.
   
6. When prompted, press Y or Enter to generate e-Invoice for the transaction and enter your e-Invoice credentials.

The e-Invoice gets generated. The voucher also gets updated with the Ack no. and IRN.