Determining a group item

[Joseph Reichman]

Is there any way of determine a group item 

I was always under the impression that 

For instance FIELDA     DS    0CL10
The L’FIELDA length would by zero

Just ran an assembly and did a SETA     &A L’FIELDA and then.   DC F’&A’ and it 
was 10 

So my question becomes is there any way of determining a group item

Thanks