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* A maintenance branch is called x.y.* (* start to 1 and is increased for each new maintenance version).
 
* A maintenance branch is called x.y.* (* start to 1 and is increased for each new maintenance version).
 
Only changes to fix "blocking", "annoying" or "security" bugs can be done. Bugs making a new feature not available (when feature was never available) must not necessarly be fixed. It 's just a feature not yet ready into this branch, it will be available with next branch.  
 
Only changes to fix "blocking", "annoying" or "security" bugs can be done. Bugs making a new feature not available (when feature was never available) must not necessarly be fixed. It 's just a feature not yet ready into this branch, it will be available with next branch.  
* Following things are allowed:
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* The following things are allowed:
 
** Change code to fix "blocking", "annoying" or "security".
 
** Change code to fix "blocking", "annoying" or "security".
 
** Increasing size of a field
 
** Increasing size of a field
 
** Adding a performance index
 
** Adding a performance index
* Following changes are not allowed:
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* The following changes are not allowed:
 
** Adding or removing fields or tables is not allowed
 
** Adding or removing fields or tables is not allowed
 
** Adding a foreign key or unique key.
 
** Adding a foreign key or unique key.