Call to package procedure in Oracle not working

We have migrated from Oracle to PostgreSQL and one thing could only be tested in Production and of course it is not working so I am desperate for a solution.

In Oracle (it works here), we had a database link and a synonym to a subroutine in the foreign table package:

• DBLINK to another Oracle database: REMP_MSS
• Package name in REMP_MSS: REMP_API CREATE OR REPLACE SYNONYM "PGXLIMSP"."REMPASS_API" FOR "REMPASS_API"@"REMP_MSS”
• SYNONYM:      CREATE OR REPLACE SYNONYM "PGXLIMSP"."REMPASS_API" FOR "REMPASS_API"@"REMP_MSS";
• Call from an Oracle procedure rempass_api.put_line(0,'');

This is what we have in POSTGRESQL:

• Using oci_dblink, a foreign server named REMP_MSS, this link works because we can query tables in this database
• SYNONYM: CREATE OR REPLACE SYNONYM "PGXLIMSV8"."REMPASS_API" FOR "REMPASS_API"@"REMP_MSS”
• Call from Oracle procedure rempass_api.put_line(0,' '); but get the error message “schema REMPASS_API@REMP_MSS does not exist”

In the Oracle database this is the package that has the put_line subroutine

We gave tried several variations of the call but all error out with “schema xyz does not exist”:

• CALL "REMPASS_API@REMP_MSS".put_line(0,'');
• CALL "MSS.REMPASS_API@REMP_MSS ".put_line(0,'');
• CALL "MSS.REMPASS_API@REMP_MSS ".put_line(0,'');
• CALL "rempass_api@remp_mss".put_line(0,'');

Can anyone help?

Best Regards,

Karen