原文 https://archive.sap.com/discussions/thread/3641585
First you reverse engineer from a script where the GUID is, into the PDM, there you should get an "internal" type CLS in the model.
this should be in mssql20???.xdb, if not you can add it(what i did in this example):
then you create the model by changing the type to Postgres, where the internal type CLS should be translated to varchar(max)
and for that you need to add:
