Creating LENGTH_UNIT entity for output

[gkovacsds]

I'm new to StepCode, trying to achieve geometry output (AP210).

I'm stuck on creating a valid LENGTH_UNIT entity.

My code so far:

 // InstMgr* is;      

 SdaiLength_unit* lu = new SdaiLength_unit();
 SdaiSi_prefix_var* pv =  new SdaiSi_prefix_var();
 *pv = Si_prefix__milli;
 SdaiSi_unit* su = new SdaiSi_unit();
 su->prefix_( *pv );
 SdaiSi_unit_name_var* sun = new SdaiSi_unit_name_var( Si_unit_name__metre );
 su->name_( *sun );

 ???

 is->Append( lu, completeSE );

What should be written to the place of ??? to achieve on creating the output file:

#xxx=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.));

Now it just outputs:

#xxx=LENGTH_UNIT($);

How can I put the SI_UNIT after LENGTH_UNIT, shall I also add a NAMED_UNIT too? How to link these after each other to one line of STEP output?

Thank you!

[gkovacsds]

OK, I've found the code in the included ap203min example, using a class called STEPComplex.