Caution: There are still purchase orders for the asset. Check.

What causes this issue?

You want to block asset &V1& &V2&. However, there are still purchase
orders or contracts for this asset.
Check if the purchase orders are still open.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Blocking the asset can lead to problems, when the goods receipt or the
invoice receipt for this purchase order is posted.
If you still want to block the asset, you must correct the account
assignment to the asset in the purchase order.
Or you must cancel the purchase order.

Error message extract from SAP system. Copyright SAP SE.