Forum Discussion
Dataflow Gen2 Mashup Error
Hi EdMk,
This error is coming from the gateway, not the Lakehouse or Dynamic schema itself.
The pattern “Error in committing version … We can’t update the value … Detail = #table({"Version","Published","Data","Modified"}, {}) … Error code: 999999” is a known issue with older on-premises data gateway versions when a Dataflow Gen2 writes to a Lakehouse and does a Replace on later refreshes.Ask your admin to update the on-premises data gateway to the latest version (Manage gateways → select the gateway → if “Update” appears, run it, or download the latest build and install it).
After the gateway upgrade, re-publish the dataflow and run the refresh again.
If it still fails, try temporarily switching the destination mapping from Dynamic schema to a fixed schema just to confirm it’s only the gateway issue; then log a Fabric support ticket with the refreshed Request ID.
Also you can follow this link for your reference.
If this helps, please give it a kudos 👍 and mark it as Accepted Solution ✅ so others hitting the same Dataflow Gen2 Mashup error can find it easily.
Thanks & Regards
Shashi Paul
Hi EdMk,
This error is coming from the gateway, not the Lakehouse or Dynamic schema itself.
The pattern “Error in committing version … We can’t update the value … Detail = #table({"Version","Published","Data","Modified"}, {}) … Error code: 999999” is a known issue with older on-premises data gateway versions when a Dataflow Gen2 writes to a Lakehouse and does a Replace on later refreshes.
Ask your admin to update the on-premises data gateway to the latest version (Manage gateways → select the gateway → if “Update” appears, run it, or download the latest build and install it).
After the gateway upgrade, re-publish the dataflow and run the refresh again.
If it still fails, try temporarily switching the destination mapping from Dynamic schema to a fixed schema just to confirm it’s only the gateway issue; then log a Fabric support ticket with the refreshed Request ID.
Also you can follow this link for your reference.
If this helps, please give it a kudos 👍 and mark it as Accepted Solution ✅ so others hitting the same Dataflow Gen2 Mashup error can find it easily.
Thanks & Regards
Shashi Paul