Pick Up Location - not valid

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I have added a pick up location to my site which is my physical shop address....
However all the inventory of stock is recorded at the warehouse. When you choose pick up at checkout it says to the customer it is not available - I'm thinking that this is because shopify thinks there is no stock there.
But at the moment - I physically take the stock to the store for pick up.
How do I allow pick up if there is no stock at the pick up address?