BPDM Gate: Parallel insert with same external id accepted in gate

[AmirMattarx]

Current Behavior

Currently when trying to insert records in parallel into the gate and if we have same external id during the parallelization process , then all of the external ids will be accepted and inserted into the gate , which will cause duplicated records with same external id in sharing state and business partner table .

Expected Behavior

For each external Id we must have only one record in sharing state , and one record is connected inside business partner table with one sharing state id .

Steps To Reproduce

Execute a parallel insert into the gate using Postman or any other app, and both inserts to contain exactly the same external ID .
The insertion should be done in separate requests but executed in the same time .
Can be done with the help of Flows in Postman as an example .

See the attachment as evidence of the bug .