Conversion factor

HALB material UoM is "sqin" which is input for two different FERT part numbers (UoM is 'EA') having two output.

Conversion factors maintain in FERT material part number, but when SAP converts "sqin" to "EA", the conversion is beyond 6 decimal point & SAP allows only upto 3 decimal.

Attached image of BOM and there output.

Please suggest the solution