# Engineering Workbench Application Error **Category:** [Epicor ERP 9](https://www.epiusers.help/c/e9/7) **Created:** 2017-01-12 19:09 UTC **Views:** 922 **Replies:** 2 **URL:** https://www.epiusers.help/t/engineering-workbench-application-error/36890 --- ## Post #1 by @rhldbrn Getting this message in the Engineering Workbench "Index 2 is either negative or above rows count". Typically happens when checking parts in or "undo" checkout function. I've seen posts for similar errors in other modules but not for Eng. Workbench. --- ## Post #2 by @Joe_Tahan what was it that you were making changes to? I usually have this error come up in BAQ's but never the ENG workbench --- ## Post #3 by @rhldbrn Doesn't seem to matter...could be operations or the bom. However, since you mentioned BAQ I should turn those off and recheck it. Is there something in my BAQ's to look for?? --- **Canonical:** https://www.epiusers.help/t/engineering-workbench-application-error/36890 **Original content:** https://www.epiusers.help/t/engineering-workbench-application-error/36890