1.   The relation LECTURER-MODULE gives the module number the name of the lecturer presenting the module and the number of weeks it lasts.

2.   A letter added to a module issue number, to indicate development versions of a module.

3.   A copy of a module which is uniquely identified by its module issue number and is related to other versions with the same module name.

4.   NDEV Whilst the file you wish to enter is syntactically correct, the module issue number is not a development version.

5.   NLTR Whilst the file you wish to enter is syntactically correct, the module issue number is not later than the latest known to LIFESPAN.