How to restrict the available assets based on Customer selected at Subscription Header level?

Summary:

Need to restrict the available assets based on Customer selected at Subscription Header level.

Content (required):

We are facing an issue during addition of assets to an extended warranty type item, where users are able to add assets belong to different customers.

Step to follow, to replicate the issue:

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1. Select a customer during creation of a subscription header.

2. Add a product (of extended warranty type item) to that subscription.

3. In the 'Covered Level' subtab, add an asset in that extended warranty type item.

Current Behavior:

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In the 'Covered Level' subtab, users are able to add an asset from a different customer also than the one present in the Subscription Header.