Message type: E = Error
Message class:  FI_E - Message Class for FM English Developers 
Message number: 135
Message text: Adjusted net due days &2 is less than the first discount days &1
You have the Prompt Payment Act feature active for your company code.
The vendor in this invoice is flagged to receive penalties as per
Prompt Payment Act rules.
There has been an adjustment to the net due days. The adjusted value is
&V2& days. However, this is less than or equal to the number of days
for the first cash discount period of &V1& days - an impossible
business scenario.
This invoice document cannot be posted.
Check the payment terms of the vendor, the payment terms of any special
material you may have been invoiced for, and the negative grace days
and make necessary adjustments. Then post this document again.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FI_E135, which states "Adjusted net due days &2 is less than the first discount days &1," typically occurs in the context of financial transactions, particularly when dealing with payment terms and discount calculations in accounts payable or accounts receivable.
Cause: This error arises when the adjusted net due days (the number of days until the net amount is due after considering any discounts) is less than the first discount days (the number of days within which a discount can be taken). This situation is logically inconsistent because it implies that the payment due date is earlier than the date by which a discount can be applied.
Solution: To resolve this error, you can take the following steps: Review Payment Terms: Check the payment terms assigned to the vendor or customer. Ensure that the "first discount days" and "net due days" are set correctly. The net due days should always be greater
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