Reproduce:

• open model from support case (expression without xsi:type attribute)
• try to edit the expression on properties panel

Problem:

• Error, cannot be edited

What does the BPMN say:

• for non-executable processes, the xsi:type attribute for expressions is not required
• for executable processes it is required

Solution?

• we have to make sure, that we
  • do not get error for expressions without xsi:type attribute
  • do not produce executable models, which do not have the xsi:type attribute

--> see scenario 2 in the support case