CONNECT Edition 10.0.9.74
In OpenPlant IM CE, the requirement is to change the default revision format of the Isometric. By default, it takes the Alphabet as revision. Refer to the attached image belowThis wiki article will explain how to change the format from Alphabet to number.
If above problem still persists, then please create a Service Request and contact the Bentley Product Advantage group. Please include a list of all relevant details to get in depth analysis for a solution or workaround