All,
Thanks for your feedback.
I have now resolved the issue through the below:
In PcmPresObjectRepository.ins file which defines presentation objects for maintenance module, mentioned 2 views (MOBMGR_ACTIVE_ROUTE_WO and MOBMGR_ROUTE_WO) were not connected to the form frmWorkOrderRoundTab.
As granting these views to the permission set has resolved the issue.
This was confirmed by IFS Support after their investigations.
Apparently there is no screen or means of knowing this information in advance which is not very helpful for the customer.
As a customer/user of IFS, you naturally assume by granting full access grants all the necessary views/APIs to the permission set, but obviously this is not the case.
Regards
Shaun