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21 July 2014

The use of K2 data fields

K2 developers always ask themselves the question when to use K2 data fields, or what is the correct best practice when using data fields.

It is important to realise that K2 data fields are global to a K2 process, and like any global variable, it’s existence and usage should be carefully considered.  The decision should generally not be a difficulty and time consuming one to make, but it can impact the future maintainability of a K2 process.

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The first question you need to ask yourself relates to the scope of the K2 data field.
1. K2 process wide, and tied to the process instance’s version
2.  K2 activity wide
3.  System wide, tied to no version of a K2 process or a K2 activity, but a reference is required in K2.

If there is a requirement to have access to the field throughout the K2 process and the value generally stays static and is used in pure K2 workflow routing decision making, a global K2 process variable can be defined.

If there is no global scope requirement for a K2 data field and it is merely used in context with a K2 activity and are generally static, it can be defined at the K2 activity level.

If the value is extremely dynamic, its version not tied to the lifetime of a K2 process instance and it could in future be used in conjunction with many additional data fields (for example to make routing workflow decisions or for K2 rule evaluation), the use of a non-K2 data field approach is sensible.  The implementation of this pattern still require a single K2 data field to be defined, but this merely acts as a reference to a system business object.  This object is typically rapped around a K2 SmartObject and additional future properties can simply be added and referenced in the K2 workflow.

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