Currently the scripts in DSPCommon used to create the SAP System Type Models look at the DD tables in dgSAP. Many Migrations have different SAP systems as both source and target. System type models need to be created for both of these. Current fix is to modify scripts to look at database required.
By creating a new system type model, this functionality already exists in the DSP platform. Common - Configuration - System Type Models
You can create additional system type models and point them at the relevant databases. All you need to do is ensure that the views are copied into that database. When you go to the system type and choose to import the model, you can then specify the datasource you are expecting to find the views in and it will pull from that database