Dear Callie de Jager it seems i found a solution to your problem or at least to mine one...
My problem was i had thousands of plans to start with different offsets since they belong to equipment's which had previous maintenance...
When i go manually to IP10, i choose start-in-cylce and then if i just put a number and press ok nothing happens and i receive the message "No offset defined"... The only way i had to do it was to define the offset on the graphical display which appears when you press the button "Select Package" .
The weird part comes now...
That doesn't happen when you make it by record...
So i just made a simple record with IP10 and i selected "start-in-cycle" by pressing CNTRL-F7 and i putted the number of my offset. And it worked...
So for example i had an equipment with 74432 H on its counter and i wanted to define my start-in-cycle at 74250 (i have 250 / 500 / 1000 / 2000 / 4000 / 6000 H packs on my strategy).
When i do it manually i need to put 74250 on the Complete count reading and then i have to go on the graphical display to select the 74250 H offset but by LSMW i just need to put the 74250 on my RZAEH field and it will assume the offset 74250...
Hope this solve your problem as well...
Cheers