ap_vendor_pub_pkg.update_vendor_public returns status U but no error messages.

I am using the ap_vendor_pub_pkg.update_vendor_public() to update a vendor name. As the title state, the function is returning status = 'U' but no errors.

Is there something missing??

Although I am not using exactly the example, my alternative is very simple.

I have limited access to the functions in the apps schema and nothing in the zx or iby or hz schemas.