If I test the query with INTERBASE there is no problem but with gvib I get the following error : Error, Products.gvibDA.gvib.gvibExceptions.Error: - Dynamic SQL Error -- SQL error code = -204 -- Table unknown -- SLID_PROB SQL used: select ZEB_REPORT.REP_CODE, ZEB_PROBE.PROB_TARGNAME from SLID_PROB, ZEB_PROBE, ZEB_SLIDE, SLID_REP, ZEB_REPORT where ZEB_SLIDE.SLID_CODE = SLID_PROB.SLID_CODE and ZEB_SLIDE.SLID_CODE = SLID_REP.SLID_CODE and ZEB_REPORT.REP_CODE = SLID_REP.REP_CODE and ZEB_PROBE.PROB_CODE = SLID_PROB.PROB_CODE;