Error in Workflow-step

hi,

i have mad a modification in my workflow, now it is stopped with the following error:

Source (expression '&_WORKITEM.WORKITEMFATHER.WORKITEMID&') of binding assignment is not availabl

Message no. SWF_BND_001101

i have tried to put the workitem-id of the workitem-father to my step in the bindings. i don't understand

why this error occurs.

when i look to the container in workflow log in my step the workitem-id mentioned above is filled with a value.

any ideas ?

best regards, Martin