Great question! In Odoo v18 (Odoo.sh), there's no built-in filter on the Replenishment Report to filter by specific SO or MO directly. However, here are the best workarounds:

**Option 1 – Use the Forecasted Inventory from the Sales Order**

1. Open your Sales Order → click the "Delivery" smart button
2. 2. From the delivery, click the "Forecasted" button — this shows forecast per product linked to that delivery
3. 3. Products in red/negative forecast indicate a shortage for that specific chain

**Option 2 – Use the Manufacturing Order's "Availability" Check**

1. Open the MO → click "Check Availability"
2. 2. The components tab will highlight in red any products that are unavailable
3. 3. You can also click the "Replenish" button directly from the MO for missing components

**Option 3 – Filter Replenishment Report by Source Document**

Go to: Inventory → Operations → Replenishment

In the search bar, use the "Source Document" filter or group by "Source" to filter entries related to a specific SO/MO reference.

**Option 4 – Use Demand Analysis Report**

Go to: Inventory → Reporting → Inventory Analysis

Filter by the demand source or apply a custom filter on move_dest_ids to trace back to the originating SO.

For a more automated "shortage per SO" view with direct filtering, that would require a custom module. If you need that, I can provide a custom module for this — reach out at custom@trewac.com