How to check out items?
To begin the checkout process you must enter the patron barcode or part of their name. The checkout option appears in three main places:
If you check out an item that has multiple pieces and you have cataloged that information in subfield 3 of the item record (in MARC21) a message will pop up when you check out that item telling you how many pieces should be there.

There are times when Koha will prevent the librarian from being able to check out items to a patron. When this happens a warning will appear notifying the librarian of why the patron cannot check items out.
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Patron owes too much in fines
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You can set the amount at which patron checkouts are blocked with the noissuescharge system preference
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Patron has a restriction on their account
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This can be set by the librarian editing a patron record and adding a restriction or by the Overdue/Notice Status Triggers
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If the staff member has the right permission they can override the restriction temporarily
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Patron needs to confirm their address
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This can be set by the librarian editing a patron record and adding a flag
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Patrons has lost their library card
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This can be set by the librarian editing a patron record and adding a flag
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