A work item ID is a permanent, external identifier of a work item, the value of property pyID. This value has an optional prefix portion, a number, and an optional suffix portion and is unique system-wide.
By convention, an ordinary work item ID has a prefix of W-nnnnn and no suffix, so W-9432 identifies such an object. Conventionally, a cover object ID has the format C-nnnnnn, and a folder object has the format F-nnnnn, where nnnnnn is a system-assigned decimal number.
Normally the system assigns a work item ID automatically as it creates a work item, using a prefix set in the application's application rule form.
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