Record a macro of the process and review it as your code above is missing the creation of the oeDetail record.  Likely a .RecordGenerate call.

Also, always set your .Order back to 0 after reading for a record. Saving records in composed views doesn't work nicely when your order is set to something other than 0 and you often don't see explicit errors - you just are missing records.

I'm not creating a new order. I'm trying to read an existing order header (which is working) and it's detail records (which is not working). 

The VBA code that is generated looks like this:

OEORD1headerFields("ORDNUMBER").Value = "ORD00000039" ' Order Number

OEORD1header.Order = 1
temp = OEORD1header.Exists
OEORD1header.Read
OEORD1header.Order = 0
OEORD1detail1Fields("LINENUM").PutWithoutVerification ("-32767") ' Line Number
OEORD1detail1.Browse "", 1

OEORD1detail1Fields("LINENUM").PutWithoutVerification ("-32767") ' Line Number

OEORD1detail1.Browse "", 1
OEORD1detail1.Fetch

But this is no translation of the 'PutWithoutVerification' in the Advantage API.  I have tried using this same -32767 value like this as well.

oeDetail.Fields.FieldByName("LINENUM").SetValue("-32767", false);

Usually you'll .browse/.fetch through detail lines.  But, if you want to .Read, make sure that you're passing a value that exists.  OEORDD saves the LINENUM values in increments of 32 (which can change on subsequent saves if you insert new detail lines in the middle).

Thank you.  This really helps!!

Hi Pauli, if the above suggested answer helped, please do mark it as verified for the benefit of others in this forum. Thank you!