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Please help!

I am trying to read an externally described file and automatically place
the retrieved record into a local data structure.

The following code generates this compile error:
*RNF5155 20      1 The Result-Field operand is not allowed for specified
operation.

I found this in the Websphere RPG manual for the READ command:
"READ{(EN)} name {data-structure}"
"If name refers to an externally-described file or a record format from
an externally described file, the data structure must be a data
structure defined with EXTNAME(...:*INPUT) or LIKEREC(...:*INPUT)." 
and believe I am doing this in the first 'D' spec listed below.

Can anyone help tell me what I am doing wrong here?

TIA

Tim Kredlo

Code____________________________________________________

FOpenSO_P  IF   E           K Disk
...
...
D SoRecP        E DS            ExtName(OpenSO_P:*Input)
D                                       Qualified
D                                               Inz               
D  SoArry                               Overlay(SoRecP:1)
D                                       Dim(128)
D                                       Like(A1)
...
...
 /Free
        SetLL *Start OpenSO_P;

        DoU %Eof(OpenSO_P);
            Read OpenSO_P SoRecP;
                ( I have also tried: "Read OpenSO_P OPENSORP;" with same
error.)
                (And: When I do : "Read OpenSO_P;" I get no records)
                ....
                more code in here
                ....
        EndDo;
 /End-Free

Code from DDS for externally described file Openso_P:
A                                       REF(@FLDREF)
A       R       OPENSORP   
A          R    CODE
A          R    SOSO##
A ...           Some more fields
A       K       SOSO##
A       K       SOREC#


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