Two Object Type in One Worflow

[Maorriyan]

Hi All,

I have a workflow that triggering event based on
object type ECM. From this business object type I get
the material number.
Then inside my workflow contains a task that based on
BUS1001006 to execute method display material.
When user executing display material task, I want
field material number is automatically filled to the
screen display material transaction.
I have container that contains material number, but
when I'm trying to binding this container to element
Material in BUS1001006 system error with 'Value of
expression '&BUS1001006&' cannot be used as the target
of an assignment.

How to solve this issue?

=====
Maorriyan

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