Symptom
Why can't I use variables from a prior / starting form in the workflow in a subprocess ?
Resolution
You must create the variables again in the form for the subprocess and map them from the parent to the child process.
When you create your child process, you define a start form as well there.
This form the defines the possible inputs which can be filled in the configuration of the sub-process activity in your parent process.
Keywords
KBA , BPI-SIG-PG-EDT , Process Governance Editor , How To
Product
SAP Signavio Process Governance all versions