Transaction management system

The invention relates to a computer-based method of and system for matching a set of transaction instructions received from a submitting entity with a record data set of receiving entity. The record data set includes a plurality of account records and an associated match key data set comprising a plurality of match keys, wherein each match key identifies an associated account record. The method comprises searching the match key data set using a match key derived from a received funds transfer instruction to identify an account record in said record data set thereby automatically matching said instruction to said identified record. The submitting entity selects a particular unmatched record of said data set, thereby manually matching said instruction to said selected record. Updating of the match key data set with the derived match keys of manually matched records enables later instructions providing substantially identical match keys to be automatically matched to their associated records in the account record data set.