I have been making AP214 assemblies from individual model files, and found a number of models from the wild which do not read in properly.

I'm reading in with STEPfile::AppendExchangeFile (...), which results in entity names being offset numerically from that in original file.

The entity references that are affected seem to be only those referred to from within a complex containing a B_SPLINE_SURFACE:

The full complex in question:

(
BOUNDED_SURFACE()
B_SPLINE_SURFACE (x, y, ( (#bad_ent, #bad_ent, #bad_ent), .... ), ...)
B_SPLINE_SURFACE_WITH_KNOTS (...)
GEOMETRIC_REPRESENTATION_ITEM ( )
RATIONAL_B_SPLINE_SURFACE (...)
REPRESENTATION_ITEM ( '' )
SURFACE ( )
)

The entities themselves (CARTESIAN_POINT), are successfully offset when read in, but those particular references are not offset.