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The error results from the Business Central list page on how lines are added and split when reaching a certain capacity.
In this case, inserting a new group attempts to split the line and increment the line but is unable to and causes an error on Line No 244999 which already exists.
You can use our Import Export PowerTool or a Configuration Package to export tables 70098511 “IWX Rule Definition Line” (“Line No.” field) and table 70098515 (“IWX Action Definition Line”), then update the line number on the rules line and the line number reference on the action lines.