The four strategies

Redline supports four strategies for transitioning from old part to new part. The comparison view shows all four side-by-side before you commit.

1. Run-down existing stock

Continue using the old part until all existing stock and committed POs are consumed, then switch. No stock is written off. No POs are cancelled.

When to use	Old and new parts are interchangeable; no urgency to switch immediately
Phase-in date	Latest of all strategies
Typical actions	Do not order more old parts; order new parts to arrive by the calculated date

2. New parts only

Stop ordering old parts immediately. Run down current stock on hand, but cancel incoming POs for the old part.

When to use	Open POs need to be cancelled — supplier discontinuation, cost saving, quality issue
Phase-in date	Earlier than run-down — based on stock on hand only
Typical actions	Cancel open POs; order new parts; update production schedule

3. Stop immediately

Switch at the earliest possible date — as soon as the new part can be received. Existing stock may be written off.

When to use	Safety, compliance, or quality issue requiring immediate switch. Emergency changes.
Phase-in date	Earliest — today plus new part lead time plus buffer days
Typical actions	Cancel all old-part POs; quarantine existing stock; expedite new part order

Write-off risk

Stop strategy often results in inventory write-offs. Redline will flag the estimated quantity and value before you apply this strategy.

4. Proactive

Plan the switch at a specific future date aligned with a production milestone.

When to use	Strategic changes aligned to a production event — new lot, model year, maintenance window
Phase-in date	Coordinator-selected target date, validated against ERP reality
Typical actions	Varies — actions align stock, POs, and production orders to the target date

Use the comparison view

Always open the comparison view before selecting. The right choice is usually obvious once you see dates and conflict counts side-by-side.