Update with INNER JOIN not desired results

Hello guys , im sure i am doing something wrong. I am trying to do an update in order to left black some duplicated values , based on some filters.

This is the base query , that returns men the records i want to update (EANCOD_0 field)

SELECTEANCOD_0FROM(SELECTT.ITMREF_0,T.TCLCOD_0,T.EANCOD_0,SCHEMA.ITMMVT.PHYALL_0FROM(SELECTITMREF_0,TCLCOD_0,EANCOD_0FROMSCHEMA.ITMMASTERWHERE(EANCOD_0IN(SELECTEANCOD_0FROMSCHEMA.ITMMASTERASITMMASTER_1WHERE(EANCOD_0<>N'')GROUPBYEANCOD_0HAVING(COUNT(*)>1))))ASTINNERJOINSCHEMA.ITMMVTONT.ITMREF_0=SCHEMA.ITMMVT.ITMREF_0ANDSCHEMA.ITMMVT.STOFCY_0='ESFL'WHERE(SCHEMA.ITMMVT.PHYALL_0=0))asT

This query returns 2976 results.

Ok having this i am trying to do the update but i am getting a lot more "Row(s) affected" my guess is the isuue is on the INNER JOIN...