Also, check that Application Rules are set up correctly and that no automatic application settings (such as automatic invoice adjustments) might cause this type of conflict.
If the error appears only when adding an extra line, it may point to a rounding issue or a conflict in the amount calculation for that line. Test by entering different values or adjusting the Unit Price and Line Discount fields, if used, to ensure that no negative value inadvertently results from these entries.
Sometimes refreshing the entire document total can resolve hidden calculation errors. Occasionally, Business Central can cache certain issues in ongoing sessions. Try logging out and back in or clearing your browser’s cache if you’re using Business Central in a web environment.
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