FieldSchema Function and Attached Databases

Databases
1 
dim map as recordset=db.fieldschema(tablename)

works fine if table exists (a given), AND the table is assumed to be in the MAIN database schema.
but what if it is in an ATTACHED database?

dim map as recordset=db.fieldschema("myTABLE") // works
dim map as recordset=db.fieldschema("AttachedDB.myTABLE") // does not

where “AttachedDB” is the schema name for another database that has been “attached” to “MAIN”