GR Bar Code printer (How is it selected in SAP system)

Hi Experts,

I understand that to enable print for GR we need to follow the below steps:

1) Maintain the printer in the SAP system.

2) Assign the printer to WE01 output type in OMJ3 Tcode with combination of Plant + Storage location

3) Maintain the condition record in MN21 or NACE for individual slips or collective slips.

But I find that in our system, the printer assigned to WE01 output type is $LT91, but some other printer actually prints the GR. I think SAP sends the output to the printing center using the LPR protocol.

We are using WM module also, but could not find the actual printer name in WM settings also.

If I need to change the printer to some new printer, what are the steps to be undertaken.

Thanks in advance,

Karthik