BlankShelvingLocation($itemnumber);
Set the value of the shelving location to blank when an item is issued or returned.
Set the value of the shelving location to blank when an item is issued.
This is called by C4::Circulation->AddIssue if the BlankItemLocationOnCheckout syspref is enabled
This is called by C4::Circulation->AddIssue if the UpdateItemLocationOnCheckout syspref is enabled
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