One nintex form (2013) had School Name(single line of text) field before. After below change:
added Client Choice (School/External), if select School, then School Name(single line of text) is available from a selection list (List Lookup with source list); if select External, then Company Name (single line of text) can be filled in, then "Company Name" and "School Name" fields were combined into a new field (School_Name) by a calculated value control and it into Sharepoint list .
All are fine but the workflow associated with it occurred an error if select External ( select School is fine):
Error parsing value. Value '' is not compatible with the selected output variable type List Item ID (integer)
Checked all fields, only two are numeric field ( Units, Discount), which has nothing to do with the above change. Anyone has idea on this? Thanks