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Steps to Reproduce:
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Import the BPMN to a project

Open the process

Go to Human Task named "Human Task 1" or "Human Task 2"

In the Diagram Properties go to Implementation/Execution -> Assignments

Map the Target of the output variable to "approval"

Save the Assignments

Save the process

Close the process

Open the process again

Go to same Human Task -> Implementation/Execution -> Assignments

Notice that the output variable "approval" that you just saved, is now blank
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Import the BPMN to a project Open the process Go to Human Task named "Human Task 1" or "Human Task 2" In the Diagram Properties go to Implementation/Execution -> Assignments Map the Target of the output variable to "approval" Save the Assignments Save the process Close the process Open the process again Go to same Human Task -> Implementation/Execution -> Assignments Notice that the output variable "approval" that you just saved, is now blank

When saving a process that contains the same process variable as an input/output of Human Task and input/output data of an MI Subprocess, an unexpected blocking behavior happens:
Except for the MI Subprocess, the process variable used in the output assignment is not persisted. If the user save / close / open business process, the output variable of all tasks except for MI Subprocess, is now blank

clones

RHPAM-2203 Multiple Instances: Output assignment of human task is not persisted when use data of MI subprocess