I need to produce a Data Matrix Barcode with C40 encoding.

I have a field length of 70, the barcode generates OK with all the settings at 'auto' but th barcode is not C40 encoded. If I select Base41 for C40 encoding, I get the error message 'Barcode error, barcode engine return code67.' in the print control.

I am using PReS V6.3.0.0