IFC file problem - ISO10303-21: The input data file has a syntax error

Hello,

I tried to make a workbench that write ifc from our data base (building).

When i try to read the final file, FME cannot because of syntax error for the ISO10303-21 format.

Each building has one ".." value that cause the problem.

#35=IFCBUILDING('O6Hu3fDbRB2OEJH5wcfNLw',#23,'51_102','','',#34,$,'51_102',..,$,$,$);

If i change the ".." by a $ (that mean 'Null' according to BuildingSmart) the file is fine and FME is ok to read it.

Does someone know what parameter or attribut I missed in my workbench that cause the ".." ?

Thanks !