When deploying a DataReader that uses the connection type SAP via Board SAP Connector the URL to connect to the source is not updated accordingly. Although the connection string looks correct the process is executed on a different server (QSS in this case).
You'll have to manually change each DataReader (adding a field to the mapping, saving the configuration, then removing the additional field, and saving again) to get it to work properly.
That's time-consuming and error-prone and no "real" deployment.
So, please enhance the ALM to update the according mapping. There should be no need to do anything manually after deploying.