Space or pointer error on OVRDBF

Dear list,

I've having a problem, and I need suggestions.  Here are the facts:

1.  CL program A (called CLA) creates a single work file (called WFx).
     A.  WFx will be 1 of 6 different formats (called WF1, WF2, etc) based on logic in CLA.

2.  RPGLE program A (called RPGA) uses FileA as it's main file. 
     A.  FileA is, in reality, externally defined, containing 20 fields with a length of 3155.  FileA is,
          however, internally defined in RPGA, with a length specified as 3155.

3.  CLA overrides FileA to WFx LvlChk(*No) and calls RPGA.  4 of the possible 6 WFx's process
     normally, but with 2 WFx's, RPGA gives me the following messages:

     - Space offset X'00000F80' is outside current limit for object WF4
       QTEMP     WF4.
     - Function check. MCH0601 unmonitored by RPGA at statement 0000000668,
       instruction X'0000'.                                               
     - Pointer or parameter error (C G D F).

     The 'Pointer or parameter error' happens at the 'Read FileA' statement of RPGA.

4.  I've checked the obvious things (at least obvious to me).  I've made sure none of the WFx's
     records formats are larger than FileA, overrides are in effect when the program was called, etc.

Any ideas ?

Thanks,

Mike Schlemme