A very strange issue. I am getting
Error in line:
ORr.SerNr=NextSerNr("ORVc",ORr.OrdDate,-1,false,"");
Error 1:Field missing: OrdDate

for the code

ORr.OrdDate = StringToDate(ImportField);
ORr.PlanShip = ORr.OrdDate;
ORr.SerNr = NextSerNr("ORVc",ORr.OrdDate,-1,false,"");

OrdDate is present in ORVc, I even check export/import format report.

Any ideas?