Task container to workflow container binding

Hi all,
I have a requirement to send mail to department responsible of a quality notification as soon as it is created from defects recording.
I am using sendmail step for this but since it doesnt have agent determination using rule, I am forced to create a background step which captures the value of department responsible (IHPA-PARNR) and passes on to a element in workflow container. The idea was I could later use the value of this container element in my send mail step which follows.
For this, I have defined a background step in my workflow template. The method in the standard task of this step refers to a function module.
The function module takes quality notification number as input (QMEL-QMNUM) and outputs the partner number (data type IHPA-PARNR).
I want to capture this partner number into my workflow at runtime. For this I defined a workflow container element refering to IHPA-PARNR so that it can bind to the export parameter of the task, which gets the value from method.
when I test my function module it works fine. BUt when I try to bind the task to my workflow, the binding between the elements refering to IHPA-PARNR gives error this error message:
" incompatible data type reference"
whereas the data type reference is same for both container elements.
Please help.
Thanks
kiran

Hi Ramki,
This is the binding from workflow to task container.
X                 => &EXPRESS&
G                 => &TYPEID&
&DEPTRESPONSIBLE& => &ADDRESSSTRINGS&
Here the DEPTRESPONSIBLE is the WF container element which gets the value of department (basically a org structure IHPA-PARNR) via a background task in the previous step.
And in the recepients list, I have given
recepient type : organizational object
expression     : &DEPTRESPONSIBLE&
I think this is where the problem is. Because when I give workflow initiator as recepient, it works fine. But when I give the department responsible as expression as shown above it errors out.
It also works fine when I hardcode the value of department responsible in the recepients list (say 50001930)and give recepient type as Organizational object.
So the problem is it is not taking the value stored in the container element &DEPTRESPONSIBLE& as the recepient.
Any ideas.
Thanks a million.
kiran

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three are five container, for each container we have define according to requirement of that particular container.
1. event container
2. workflow container
3. task container
4. method container
5. rule container
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hi Experts,
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Hi Praveen,
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Hi,
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