I would use RW_Strip() user defined function (system series) to remove the commas.
For example RW_Strip(Field, ",")
However, the QTY field should already be a currency datatype and should not require any conversion to be used in a calculated field.
David Musgrave [MSFT]
Escalation Engineer - Microsoft Dynamics GP
Microsoft Dynamics Support - Asia Pacific
Microsoft Dynamics (formerly Microsoft Business Solutions)
http://www.microsoft.com/Dynamics
mailto:David.Musgrave@online.microsoft.com
http://blogs.msdn.com/DevelopingForDynamicsGP
Any views contained within are my personal views and not necessarily Microsoft policy.
This posting is provided "AS IS" with no warranties, and confers no rights.