[Koha] Can't search by branch

I imported a batch of Marc records from Horizon 7.3.4. By default, Horizon puts library branch code in subfield m of tag 949 while put item type in 949 t. I deleted the whole 952 in Koha and re-configured 949 in order to map Item.homebranch to 949's m and item.itemtype to 949 t. Of course, I have created a same branch code and itype in koha. Now, I can search by itype and find titles imported from horizon, whereras search by branch flatly blew. Even, I can not search by any branch name except any branch. Thank you. --------------------------------- All new Yahoo! Mail - --------------------------------- Get a sneak peak at messages with a handy reading pane.