added ability to schedule payment on DOM

src/cljc/auto_ap/entities/vendors.cljc

@@ -12,6 +12,7 @@
 (s/def ::hidden boolean?)
 (s/def ::print-as (s/nilable string?))
 (s/def ::terms (s/nilable int?))
+(s/def ::dom (s/nilable int?))
 
 (s/def ::invoice-reminder-schedule (s/nilable #{"Weekly" "Never" nil}))