Hello Luis,
I will explain you the scenario.
Here we have two crm system, lets say A & B.
When i create any transaction in system A it will store in system B through idoc.
So now what is happening is,when i create any activity from opportunity , it will have 2 partners say employee responsible and activity partner in system A, So now it will flow through idoc to system B.
now here in system B when i open this activity it will have many additional partners in parties involved assignment bock ,and these partners are related to the opportunity.
What i think is it is happening because of partner determination procedure.
So how will find at which point the partners are getting added and how ll i stop this additional partners.
Best Regards,
NIkhil