Issue facing while assigning line to shipment

Summary:

we are using OIC integration to assign the line using webservice. We are able to assign the line but some time I am facing the below issue.

Error:

<ns0:MessageText>Another person is working on the records you are attempting to work on. Try again later.</ns0:MessageText>

Did anyone face similar issue? can someone guide us.

Payload error:

<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsa="http://www.w3.org/2005/08/addressing">

<env:Header>

<wsa:Action>http://xmlns.oracle.com/apps/scm/shipping/shipConfirm/deliveries/shipmentLineService/ShipmentLineService/ManageShipmentAssignmentsResponse</wsa:Action>

<wsa:MessageID>urn:uuid:2f0404f6-8328-4b2a-9224-663b85a9ec76</wsa:MessageID>