CALL FUNCTION in UPDATE tasl

Hi all,

I am calling a Z FM in update task from MB1B exit .

When I am using the VPN cllient , the FM is getting trieggered properly , but while using the MetaFrame Presentation Server i.e. Citrix client server , The FM is not getting triggered

Does Update task work only while a VPN client ???

Any specific settings required while in Citrix ?

Thanks

Supriya