# Filtering the list

## Filtering the list
Three filters are AND-combined with `modified_since` on the list
endpoint:
| Query parameter | Behaviour |
|  --- | --- |
| `object_number=<string>` | Exact match on the ERP grouping key. Returns every row that shares the value — Mercura's master-project concept treats them as one logically but exposes them as distinct rows. |
| `request_id=<int>` | Returns the single project linked to the request via `Request.project_id`. Empty page for requests with no project FK. |
| `status=<UPPERCASE>` | Restrict to one lifecycle status. Unknown values return `400 VALIDATION_FAILED`. |

Combine `object_number` with `request_id` when you need to verify
that a specific request rolls up under a specific ERP grouping key.

Version: 1.79.2

## Description:

  - `Filtering the list` ()
    Three filters are AND-combined with `modified_since` on the list
endpoint: | Query parameter | Behaviour |
|  --- | --- |
| `object_number=<string>` | Exact match on the ERP grouping key. Returns every row that shares the value — Mercura's master-project concept treats them as one logically but exposes them as distinct rows. |
| `request_id=<int>` | Returns the single project linked to the request via `Request.project_id`. Empty page for requests with no project FK. |
| `status=<UPPERCASE>` | Restrict to one lifecycle status. Unknown values return `400 VALIDATION_FAILED`. | Combine `object_number` with `request_id` when you need to verify
that a specific request rolls up under a specific ERP grouping key.