[firebase-br] ??? ISC ERROR CODE:335544351 Column has been unexpectedly deleted

[AndreS&Sinfo]

Apos o seguinte comando da esse erroo que será ?

ALTER TABLE TIPO_TAXAS ADD C14OBSERVACAO VARCHAR(500);

da esse erro:

ISC ERROR CODE:335544351

ISC ERROR MESSAGE:
unsuccessful metadata update
STORE RDB$FIELDS failed
Column has been unexpectedly deleted