Hi,
If you can provide some screenshots then please provide for project structure with PR number generated. And the same PR with budget error.
What steps are you following?
Create project.
attach material component.
assign budget
release activity
save project (PR number will come after saving project)
Normally, system will give error while saving the project in case budget is exceeded and no PR is generated.
Try with a new project.
Regards,
Harsh.