Importing layers from GDS inside Virtuoso which are not in the PDK layermap file

Hi All, 

I am importing a GDS inside Virtuoso when I am seeing the below warnings in the stream log file indicating that some of the custom layers didn't get imported. 

WARNING (XSTRM-36): The objects in the stream layer-datatype '189:0' are ignored. This is because the stream layer-datatype pair is not specified in the layer map file. Specify the stream layer-datatype pair in the layer map file and try again.
WARNING (XSTRM-36): The objects in the stream layer-datatype '192:0' are ignored. This is because the stream layer-datatype pair is not specified in the layer map file. Specify the stream layer-datatype pair in the layer map file and try again.

So do I just need to add the missing layers in the localized layermap file and re-stream in the GDS file ?

I am using IC6.1.8

regards