Whilst it is recommended that unique Declaration Unique Consignment References (DUCRs) are specified from traders' own commercial records - this can be anything unique to the trader - the use of the DUCR Part suffix allows two or more Import declarations to have the same core DUCR.
On Customs Handling of Import and Export Freight (CHIEF), up to four characters have been made available for the Part suffix that, in combination with a DUCR (of up to 35 characters), must be unique.
Whilst the optionally completed DUCR Part suffix can contain a three-digit 'Part' Number and an optional alpha check letter - for example '001A' - Procedure for Electronic Application for Certificates (PEACH) will not permit you to enter the alpha check letter into the optional Part Number field.
The alpha character check letter is ignored by the Automatic Licence Verification System in matching. In the above example, the Part number would be entered in the PEACH Advance Notification Part field as '001'.
Part Numbers can be entered with leading zeros in both CHIEF and PEACH. Where a Part Number is used, the same exact Part Number must be entered, unless you wish to take advantage of Bulk Matching.
For example, if you enter a Part of '03' into PEACH, then the CHIEF Part must be entered as '03' and not '3' or '003'.