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Time based safety stock
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You can define a time based safety stock for a buffer. This means that we will try
to plan the replenishment a certain time before the material is required. This creates
a temporary inventory that is useful to absorb variability and uncertainty.

From a modelling point of view, this is achieved by defining a post-operation
time on the replenishing operation of the buffer.
See the example :doc:`post-operation safety time <../operation/operation-posttime>`.
