WBS Numbering Error

I'm not sure if anyone will be able to help with this one, but I am running into an occasional problem that I don't quite understand.

Essentially, I have a WBS numbering system running to give tasks an ID, and then using the ID to look up a letter equivalent from another sheet, and using that for the Item Label of each task.

The problem is that sometimes it returns a #NO MATCH or sometimes even a 0, which isn't even in the list to choose from. It will also sometimes number rows out of order.

I followed this tutorial to create the WBS system:

The sheet with the letter equivalent:

A screenshot example of the error (the coloured rows are different departments):

Sometimes if I copy/paste the info into new rows the error fixes itself, but not always.

Any insight into how to fix this, or avoid it in the future is apprecaited.

Thanks

Answers

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