This code breaks right before the wait window '3 '+alias() line with the error:
'Function argument value, type, or count is invalid.'

Doing a getfldstate before I click my action button shows:

34444444444444444444444


(in data environment, table customers is open, view custupdate is open with records for writing back onto and a table called custnums is open which is not related to this function)

?!


CursorSetProp('buffering',1,'Customers')
select CustUpdate
wait window '1 '+alias()
lnFieldCount = AFIELDS(laFields,'CustUpdate')
FOR nNothing = 1 TO lnFieldCount
wait window '2 '+alias()
DO CASE
CASE GETFLDSTATE(nNothing,'CustUpdate') = 3 &&Breaks Here
wait window '3 '+alias()
SETFLDSTATE(nNothing,1,'CustUpdate')
CASE GETFLDSTATE(nNothing,'CustUpdate') = 4
SETFLDSTATE(nNothing,2,'CustUpdate')
endcase
ENDFOR