PRECONDITIONS|
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Syspref OPACShowPlaceItemLevelHold shoud be allowed, or the biblio must be a serial.

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TESTING DATA:
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Biblio must have items.


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WHAT SHOULD HAPPEN
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In opac-detail.pl:
A "Place hold"-link should appear after each Item-row.
For serials the "Place hold"-link in the sidebar vanishes.

Clicking the item-level place hold link, directs the user to opac-reserve.pl which is
  modified to show only the selected item, preselect it and hide unnecessary buttons.
  
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LIMITATIONS
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In opac-detail.pl, it is not checked whether or not the item can actually be reserved.
This is so on purpose because of performance reasons.
The way C4::Reserves::CanItemBeReserved() works, would totally destroy any performance
  on opac-detail.pl for larger Items volumes.
  
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TEST CASE1   book, with items
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1. Go to opac-detail.pl
2. Verify that items have "Place hold" link after them.
3. Click the Place hold link.
4. Make a hold as usual.


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TEST CASE2   serial with items
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1. Go to opac-detail.pl
2. Verify that items have "Place hold" link after them.
3. Verify that the sidebars "Place hold"-link is gone.
4. Click the Place hold link.
5. Make a hold as usual.