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ERROR: Workflow state transition not allowed

Hi everyone,

i have a sales order which before the update i could press “refresh” and if the corresponding sales invoice was submitted would change workflow state from X to Y. Now i get this message “Workflow State transition not allowed from XY to YZ”.
This state change, as far as i understand, is done by a custom script, which changes workflow state based on some conditions.

I could not find anything online or in the forum.
Please help

Kind regards,
Marek

I solved it. There had to be a workflow transition defined in order for the script to work. Workflow transition has dominance over the script and was blocking the script because it was not defined.
Closing this thread.