Calling ERP Web Dynpro from CRM Opptunity with parameters

Hi, experts!
In CRM7.0, I'm calling ERP Web Dynpro from CRM Opptunity.
We've added a button in Opptunities and the buttom can navigate into ERP Web Dynpro.It works fine.
Now, I'm trying to move the value of Opptunity ID to a field in ERP Web Dynpro when we push the buttom. That's a problem I want to solve. We're struggling to move the value, but it doesn't work.
We uses the following settings:
1) We call Z- Logical Links generated by Transaction Launcher when we push the buttom.
2) We define Transaction Parameters in a Transaction Launcher Wizard(Step5). We've set "//clipboardBTOrder/BTOrderHeader/OBJECT_ID" or "//datacontextCURRENTBT/BTOrderHeader/OBJECT_ID".
But both of them doesn't get any value.
3) If you set SYST data or constants in Transaction Launcher Wizard(Step5), you can find the data in ERP Web Dynpro.
Does anyone know which parameter gets the value of current opptunity data?
Or if you have any tips to create URLS using programing, could you please share the information with me?
BestRgards.
Miki

Does anyone have tips??

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