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This patch fixes a major issue introduced by the commit 5c4fdcf7 Bug 11742: A letter code should be unique. The interface should let the possibility to create a default template letter and some specific ones, with the same letter code (letter.code). The patches submitted on bug 11742 tried to fix an issue based on a (very bad) assumption: letter.code should be considered as a primary key and should be uniq. This patch reintroduces this behavior. Note that the interface will block a letter code used in different module (this is consistent not to have the same letter code used for different needs). This patch is absolutely not perfect, it just tries to change as less change as possible and to use new tested subroutines. Test plan: 1/ Verify that the problem raised on bug 11742 does not appears anymore. 2/ Verify there are no regression on adding, editing, copying, deleting letters. 3/ Verify you are allowed to create a default letter template with a letter code and to reuse for a specific letter (i.e. for a given library). Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz> Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de> Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
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