Sintax Error with trigger executing dbimport in Linux-IDS.9.30.UC3

Hi, I've a problem when importing via-dbimport a database. In the code showed below we can see two codes : 1.- Source code of trigger cefeconh_upd, where we are programing an UPDATE of column aptcon to NULL... 2.- Code unloaded by dbexport of the same trigger. Gere we can see that IDS has "loosed" the NULL word in the UPDATE statment and it produces a sintax error when processing de dbimport. 3.- The trigger is correctly working in the original database ( the database source of the dbexport...) This happens in : IDS : DB-Access Version 9.30.UC3 S.O.: Linux dbsrv2 2.4.19-16mdkenterprise #1 (... source code of trigger cefeconh_upd ... ) create trigger cefeconh_upd update OF proori, terori, prodes, terdes, fecpro, feccon ON cefeconh referencing new as nxt old as prvfor each row WHEN (prv.feccon IS NULL AND nxt.feccon IS NULL AND (prv.proori != nxt.proori OR prv.terori != nxt.terori OR prv.prodes != nxt.prodes OR prv.terdes != nxt.terdes OR prv.fecpro != nxt.fecpro)) ( UPDATE cefeconl SET aptcon = NULL WHERE rowenl = nxt.apteid AND aptcon IS NOT NULL, DELETE FROM cefeconl WHERE rowenl = nxt.apteid AND numero IS NOT NULL ), WHEN (prv.feccon IS NULL AND nxt.feccon IS NOT NULL) ( EXECUTE PROCEDURE cefeconh_contab(nxt.apteid, nxt.feccon) ), WHEN (prv.feccon IS NOT NULL AND nxt.feccon IS NULL) ( EXECUTE PROCEDURE cefeconh_contab(nxt.apteid, nxt.feccon) ),WHEN (prv.feccon IS NOT NULL AND nxt.feccon IS NOT NULL AND prv.feccon != nxt.feccon) ( EXECUTE PROCEDURE sdm_raise_msg(-746, 'cefeconh_upd: No se permite cambiar la fecha contable.') ); (... fragment of code from a dbschema of table cefeconh for trigger cefeconh_upd ... ) create trigger "informix".cefeconh_upd update of proori,terori, prodes,terdes,fecpro,feccon on "informix".cefeconh referencing old as prv new as nxt for each row when ((((prv.feccon IS NULL ) AND (nxt.feccon IS NULL ) ) AND (((((prv.proori != nxt.proori ) OR (prv.terori != nxt.terori ) ) OR (prv.prodes != nxt.prodes ) ) OR (prv.terdes != nxt.terdes ) ) OR (prv.fecpro != nxt.fecpro ) ) ) ) ( update "informix".cefeconl set "informix".cefeconl.aptcon = where ((rowenl = nxt.apteid ) AND (aptcon IS NOT NULL ) ) , delete from "informix".cefeconl where ((rowenl = nxt.apteid ) AND (numero IS NOT NULL ) ) ), when (((prv.feccon IS NULL ) AND (nxt.feccon IS NOT NULL ) ) ) ( execute procedure "informix".cefeconh_contab(nxt.apteid ,nxt.feccon )), when (((prv.feccon IS NOT NULL ) AND (nxt.feccon IS NULL ) ) ) ( execute procedure "informix".cefeconh_contab(nxt.apteid ,nxt.feccon )), when ((((prv.feccon IS NOT NULL ) AND (nxt.feccon IS NOT NULL ) ) AND (prv.feccon != nxt.feccon ) ) ) ( execute procedure "informix".sdm_raise_msg(-746 , 'cefeconh_upd: No se permite cambiar la fecha contable.' )); ( ... ) Any idea ??? Thanks in advance !