XPathMissingInstanceException when counting a filtered Entity List

[Sadiq_Khoja]

Can you please share the XLSForm? This looks similar to this thread though:

How to get max value of a csv file

Hi all, Here my question : I'd like to increment by 1 the value of the "id" question of my formular. For the moment I'm tring to use entities and to get the max value of the "id" field. Here is the survey tab : [Capture1] Here is my entities tab : [Capture2] Here is my entities fields : [Capture3] I attach my xls form gestionBouquetinsMarques.xls (70.5 KB) Thanks a lot for any ideas !