DBGE0001E Expression xxx is too complex

I'm running RDP 8.5 against OS V7R1.

I have a line of code that says:
OutA(1).Units(In.Mth) += In.QTYSH;

In a service entry point debug session, when I hover anywhere over the left hand side it get a Debug Engine Message:

DBGE0001E Expression OutA(1).Units is too complex.

I see a report of something similar back in WDSc and it looks like also in 8.5.

(Trying to monitor OutA doesn't work either.)

Anyone know if this fixed in 9.0? Or is it a restriction on the underlying debug engine in OS/400?

Thanks, Sam


The definitions are like this:
*=== Template for PSA100 records ==============================
ddsPSA100OUt E DS EXTNAME(PSA100:*OUTPUT)
d qualified
d Itnbr 13 overlay(dsPSA100Out:9)
d Units overlay(dsPSA100Out:22)
d like(SUNT01)
d dim(12)

*=== Arrary of PSA100 Record are built here ===================
d OutA ds likeds(dsPSA100Out)
d dim(99)