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https://help.tallysolutions.com/docs/te9rel66/faqs/8926.htm

Unable to Determine the Nature of Purchase (Transaction-Related Exceptions - Purchase/Sales)

Cause

If Nature of Purchase is set to Not Applicable in the Party Details screen of excise purchase and excise credit note transactions this exception will appear.

Solution

1. Enter on the exception.

2. List of transactions for which nature of purchase is not defined appears.

3. Press Space bar to select the transactions

4. Press Alt + S:Set Nature of Purchase

5. Accept the screen to resolve the exception.