> ## 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.

# CreateStepPartRequirementInput

> Inputs to create a StepPartRequirement, optionally pinning the part's MBOM first. ``pin_mbom_id`` lets a caller pin the part_procedure's MBOM version and create the assignment in one mutation so both share a single commit: if the SPR validators raise, the pin rolls back with it (the two used to commit independently).