When I create a dB link to one of my databases, it works just fine:
CREATE DATABASE LINK testdb
CONNECT TO wms_owner IDENTIFIED BY "the-pass0"
USING 'testdb'

When I create another link (same source database) to another database, the create works but the usage fails!

CREATE DATABASE LINK wmsp
CONNECT TO wms_owner IDENTIFIED BY "the-pass0"
USING 'wmsp1'

I get: ORA-02019: connect description for remote database not found:

SOME FACTS:
-the userid/ password and connect string are correct
-wmsp1 is defined in my local TNS and connects with SQL/PLUS ie. CONNECT wms_owner/the-pass0@wmsp1
- The instance is named WMSP1 but the dB is WMSP (some day we will use RAC)

PARAMETERS for both database are the same or equivalent:
-------------------------dB1------dB2
db_name(s)................testdb....wmsp
instance_name(s)........testdb....wmsp1
db_domain (s).............NULL......NULL
global_names(s).........FALSE....FALSE

What else could it be that makes the link not work????

Your help is much needed and appreciated