How to create a data element with this format (SSD_S21-102)

How to create a data element with this format (SSD-S21-1002), that increment it self automatic by 1.

Hello James,
If I understood correctly you wish to have the 1002 part automatically increase,correct?
What about the other parts? SSD-S21- are they fixed for all or also need to change based on some criteria (e.g. the org unit?)
Here’s another community post that talks about it:

Let me know if you need further support.
All the best,
Bernard

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Please, be aware that because of the nature of Android offline capabilities this might have an unexpected behavior as described here:
https://docs.dhis2.org/2.35/en/implementer/html/dhis2_android_implementation_guideline_full.html#configuration_reserved_id