Wait for activity to finish before next FOR loop

[Das Goravani]

Have a task variable called PDFComplete, a boolean.
Set it to zero when you start printing one invoice.
In $pdfcomplete() method, set it to KTrue
Back in printing method, do this after you print one:

While not(PDFComplete)
End While

So that just spins until $pdfcomplete sets that to kTrue

This is a simple delay technique that won’t go forward until the last one is printed.