Dear Ulrich,
let me explain an approach being a bit different from what you might expect!
There is a possible solution using Open Plan, (information: 3th party solutions)
Open Plan is a top class Scheduling tool that is linked to Baan (IV,V,LN)
Open Plan is capable of planning resources, being attached to the same Activity, at different times. One resource at the beginning, one in the middle of the duration and another one at the end. Or overlapping, or starting at the same time, but colsing the word at different end dates.
Currently Open Plan is linked with TP, PCS, SFC and Procurement. We discuss with several Clients to come up with a link for TS too, linking Preventive Maintainance and Service Order / Activities / Tasks to Open Plan as well.
So, if this approach is of interest for you, lets talk about it.
regards
Ulrich Hofmann
www.pms-c.de