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February 3, 2026
Solved

Load/Extract EventHandler

  • February 3, 2026
  • 1 reply
  • 2 views

Hi OneStream experts,

I was looking to understand if it's even possible to handle the load button from the Load/Extract section in OneStream using a specific EventHandlers of any kind.

I need to be able to add validations whenever a Metadata xml file is loaded through the Load/Extract to check certain things of its content without falling (as usual) in a custom development from scratch.

Hopefully someone is able to assist.

Thank you!

Best answer by MarcusH

The WcfEventHandler is normally used to intercept such calls but in my testing it is not fired when a metadata file is loaded or extracted. This page has a list of the service types that can be intercepted if you want to try for yourself:

Can I execute a BR after saving data? | OneStream Community

You might be able to avoid a custom development by securing the Load/Extract function (ApplicationLoadExtractPage) and then have a Data Management sequence that has steps for load and validation. The Application Control Manager solution I think has some BRs for loading metadata.

1 reply

MarcusHAnswer
February 4, 2026

The WcfEventHandler is normally used to intercept such calls but in my testing it is not fired when a metadata file is loaded or extracted. This page has a list of the service types that can be intercepted if you want to try for yourself:

Can I execute a BR after saving data? | OneStream Community

You might be able to avoid a custom development by securing the Load/Extract function (ApplicationLoadExtractPage) and then have a Data Management sequence that has steps for load and validation. The Application Control Manager solution I think has some BRs for loading metadata.