We have a requirement to use reduced inspection duration when we re-test a batch of a material.
For example when we first test a batch that has just been manufactured, the inspection duration is two years so the batch gets a next inspection date two years into the future.
When we retest this material in the future (as it approaches the next inspection date), we want to use an inspection duration of only 50% of the original inspection duration (one year in this example). So the batch gets a new next inspection date one year into the future. This applies to all re- tests (to only use 50% of the defined inspection duration).
As there is only one field in the material master for the inspection interval (in the QM view) I do not know of any way of achieving this in SAP.
How do I resolve this problem?

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Answer:

To handle the retesting with different inspection intervals, you can utilize inspection plans with a specific usage code, which in this case is 9. By creating separate inspection plans for retesting, you can define your specific requirements independently from the plans associated with usage code 1, which is typically used for production.

Alternatively, there is a user-exit called QEVA0003 that you can take advantage of. This user-exit allows you to customize the calculation of the next inspection date in the system. You would need to write a program to calculate the next date based on your desired inspection intervals.