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The combination of item type and item key should be unique, otherwise the wf engine will throw an error like "Duplicate item 'REQAPPRV/150342-427838' could not be create".1 person found this helpful
Looks like the item key '150342-427838' is already used for item type 'REQAPPRV'. Try the same with wf_engine.launchprocess() API with a different item key.
The item_key should be unique for every process, instead of hard coding the item_key the better way would be.
use a sequence/ create a unique key by using some formula/ use date time stamp.