VS Workflow - Erroring out when multiple records are created by same user

Hi,
I am using SP 2013. I have a visual webpart and custom sequential workflow. The webpart saves the data to a custom list and the workflow is associated to the custom list on Item creation only. In the workflow, I am breaking the role inheritance and setting
permission to specific set of users, and then the normal approval workflow happens. The whole workflow condition works fine, but if the user is raising multiple requests one after another, the workflow seems to break either in the Break inheritance or granting
permission. If the user raises only one or two requests then everything works fine.
Below are the errors which I am getting in the workflow:
Error 1:
Error: Save Conflict. Your changes conflict with those made concurrently
by another user. If you want your changes to be applied, click Back in your Web
browser, refresh the page, and resubmit your changes.
I have already checked this :
http://social.msdn.microsoft.com/Forums/sharepoint/en-US/60ab04fd-9650-427d-a48f-784bc22fae05/workflow-and-save-conflict-your-changes-conflict-with-those-made-concurrently-by-another-user?forum=sharepointdevelopmentprevious_
http://adrianhenke.wordpress.com/2010/08/20/sharepoint-error-save-conflict-your-changes-conflict-with-those-made-concurrently-by-another-user/
I have also implemented the "Reload" thing posted in the above URL. This error only happens when multiple new requests are getting raised by same user. This error does not happen if I terminate the workflow and re-start the workflow.
How to fix this?
Thanks

Hi,
Based on my understanding, you have a Visual Web Part for adding new item into a list. A workflow will be triggered when item creation in this list. Everything works
fine except when an user adds multiple items in a short period.
If this is the case, plus with the error message, a possible cause is that the SharePoint Server and the workflow engine are not functioning effectively enough to
handle the multiple request in a short time, therefore a scenario is that when there is new item being added into the database, the workflow modifies the “RoleAssignments” property of this item at the same time, this may cause a “Save Conflict” error.
As you said, “If the user raises only one or two requests then everything works fine”, a workaround is that you can disable the adding item function in Visual Web
Part forcibly in a specific period after a new item is being added by current user, it can leave some time for handling the item creation and item modification.
Or if there is a need to submit multiple items concurrently, we can organize the requests into one request, then handle this item with other custom logic in your workflow.
Thanks
Patrick Liang
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support,
contact [email protected]
Patrick Liang
TechNet Community Support

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