Receiving in a Generation Data Group file (GDG)

In all case, when the FNAME of a CFTRECV is set with a relative GDG name, CFT will expect a WFNAME is present so the end of transfer operation will ensure a RENAME of the WFNAME to the GDG file.
It assumes that receiving that way is always using +1 as the relative information ( GDG.FILE(+1) )