> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firstresonance.io/llms.txt
> Use this file to discover all available pages before exploring further.

# LinkRunStepToPurchaseOrderInput

> Input for linking a run step to an existing purchase order for outside processing. When the run step is part of a normalized batch and ``applyToAllRunStepsInBatch`` is ``true`` (the default), the link is also applied to every batch sibling — siblings already linked to a different PO are MOVED to the target PO. When ``false``, only the specified run step is linked and batch siblings are left untouched.