Xstep exchange parameters between 2 PI sheets

Hi All,
I am using ECC6 EHP4.
I have build up a recipe using Xstep to exchange parameter from on PI sheet to another PI sheet.
The value is created in the first one and the second displayed the result but the value is not transferred.
it is created according to sap Help:
Xstep1 node : LOCAL_PARAM parameter local and live
destination 10
Xstep1a Get value node: O_PARAM parameter output and ref to LOCAL_PARAM and live
Destination 10
Phase 20
PPPI_VARIABLE O_PARAM
PPPI_REQUESTED_VALUE PPPI_PARAMETER_VALUE
Xstep1b Display value node : I_PARAM parameter input and ref to LOCAL_PARAM and live
Destination 11
Phase 40
PPPI_OUTPUT_VARIABLE I_PARAM
Do I miss something?
Thanks for your help
Martial

Does anybody know how to check/debug why the parameter is not transferred to the second PI sheet?
Best regards
Martial

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