---
id: CFG-9
family: GR-CFG
level: core
profiles: [storage-api]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-cfg/cfg-9
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# CFG-9 — A required parameter that resolves to null fails the node

*GR-CFG (Part I) · level: core · profiles: storage-api · added in 1.0*

## The rule

> **Normative.** This is the rule.
>
> 1. Where a parameter is required and the resolution chain (CFG-4 to CFG-6) yields null, the node execution fails with a missing-parameter error naming the parameter.
>
> 2. The check runs after the whole chain has been walked and before the resolved value would be validated (CFG-10).

## Related rules

- Names: CFG-6, CFG-10
- Referenced by: CFG-10

---

Rule identifiers are permanent and are never renumbered. This specification carries
no implementation status: each implementation publishes its own standing against
these rules. Licensed CC BY 4.0.