Hide blue tab in Numbers
Hi
I have this spreadsheet for my girlfriends business. I have it automatically creating an invoice number if there is text in the cell beforehand. I have this formula "IF(C3>0,D2+1,"")" which supplies a number. There is a blue tab in the top left hand of the cell saying, "the formula compares a string to a number". Does anyone know how to get rid of this? Or can give me a more suitable formula? I have tried substituting the ">0" to " >"" " and other variations but am struggling to get anything to work. It's not a big deal but I like everything nice and tidy!!
Thanks in advance...
MacBook Pro with Retina display, OS X Yosemite (10.10.3)