Normally, any loose component changes to field because it does not need to work in shop. However, you can control this separately for pipes and fittings by modifying below settings from style.cfg. This will work with both AutoPLANT Modeler & OpenPlant Isometrics Manager & OpenPlant Modeler & OpenPlant Isometrics Manager.
When Field Fit weld has been assigned to particular set of flange or in any case the weld has been categorized to Field, it produces different Part ID under field Material. See image below:
To consolidate the material as one quantity, you need to set the variable present in Style.cfg file as IE_LooseFittingToField = 0. (Use same steps as discussed above).
See image below after modification:
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/12642.configuring-the-bom-and-reports
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