I exported this declaration from a 1.5 database, for testing in 2.1.3 in
preparation for 2.5.

DECLARE EXTERNAL FUNCTION LTRIM
CSTRING(32765)
RETURNS CSTRING(32765) FREE_IT
ENTRY_POINT 'IB_UDF_ltrim' MODULE_NAME 'ib_udf';

Executing it returns the exception:

ISC ERROR CODE:335544569
ISC ERROR MESSAGE:
Dynamic SQL Error
SQL error code = -204
Data type unknown
Implementation limit exceeded
COLUMN DSQL internal

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