Hi Team,
I have installed MYOB Advanced Build 2024.210.100.3447 [24.210.0019] on my local system and successfully applied a developer license key. After applying the license, the site and standard screens are loading fine.
As a test, I created a simple customization project that adds a boolean field to the Sales Order (SOOrder) header via a cache extension. There are no other changes in the package.
However, when I attempt to publish the customization, I encounter the following error during the validation phase attached a copy for your review.
There are no additional errors or detailed messages provided in the output log.
What I Have Tried
- Rebuilt the customization project in Visual Studio (no compile-time errors).
- Confirmed that the field is added using a clean PXCacheExtension of SOOrder.
- Confirmed no duplicate extension classes.
- Restarted IIS and cleared temp files in the validation directory.
- Tried on a fresh copy of the instance.
Request
Can someone advise how to resolve this issue or identify where I can find the detailed cause of the validation failure?
Please let me know if you need more information (such as the exact extension class code or screenshots).
Thanks in advance!

