This wiki will be helpful in case when existing fittings part-IDs are to be excluded.
1. Open Bentley Class Editor CONNECT Edition.
2. Open OpenPlant 3D schema and Supplement it with Modeling, Modeling Views and IsoExtractor schemas.
3. Go to “Plant Base Object” Class.
4. Edit the following in “Default Bill of Material Labels” custom attribute.
Copy from here: llf(IM.Match(this.STATE."EXISTING"."FOR_DEMOLITION"."").1.0)
This will help you resolve not one but two issues: Excluding Existing components from OPIM BOM and resetting Part IDs thereafter.
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.
Bentley's Product Advantage Group requests that you please confine any comments you have on this Wiki entry to this Comments or Corrections?" section. THANK YOU!