No PLC_PRG process image when starting the PLC (elimination)

Which products are affected?
EVS93xx-EI (Servo PLC Version 2.3)
EVS93xx-ET (Servo PLC Version 2.3)
EPL-10200 (Drive PLC Version 6.1)

What happens?
When the PLC is started, a process image is not generated for the PLC_PRG for several cycles.

When does the problem occur?
The problem occurs on system modules (module numbers < 100) which are only used in the PLC_PRG.

Possible diagnostics?
The file 'Process image' (under Object Resources) shows if the process image is generated in the cyclic task and the module number of the system module used.

Short-term measures?
None.

Evaluation:
The error is not critical since the time response of the PLC_PRG is not constant due to the multi-tasking.