A data processing system comprises an interface configured to communicate with a data source, a memory, and a reference data module. The data processing system comprises a processor which is configured to communicate with the memory, the interface, and the reference module. The processor is further configured to request a first list from the data source. The first list comprises a record. The record being modified based on a comparison of a data characteristic to a first reference data. The processor is further configured to receive the first list from the data source for a communication operation and to compare the data characteristic of the first list to a second reference data. The processor is further configured to generate a second list based on comparing the data characteristic of the first list to the second reference data.