Commented out export of missing CRML source file to avoid build error.
There are no known side effects of this file being missing, so this seems a reasonable way to avoid the build error.
<?xml version="1.0"?><!DOCTYPE SystemDefinition SYSTEM "sysdef_1_4_0.dtd" [
<!ENTITY layer_real_source_path "sf/os/ossrv" >
]>
<SystemDefinition name="ossrv" schema="1.4.0">
<systemModel>
<!-- Common file for prebuild layers-->
<layer name="mw_layer">
<module name="ossrv">
<unit name="ossrv" unitID="mrtdo.ossrv" bldFile="&layer_real_source_path;/group" mrp="" />
</module>
</layer>
</systemModel>
</SystemDefinition>