PL/SQL Functions becoming 'invalid'

We have created a set of functions which are used by
applications and triggers within our system. Everything ran over
the weekend and all triggers were operating and functions were
performing as expected. Yesterday the it was noticed that one of
the functions had become 'Invalid' which stopped the processing
of the system. The function is invoked by a trigger on insert
into a table.
Does anyone know what would cause a function to go 'Invalid'
like this?
Thanks
Jeff M.

Hi,
If you alter or modify the objects(DDL Operations), then the
procedures, functions, views..etc will be invalid. And also it
applies recursively,i.e,if these procedures and functions are
referred in some other procedure and functions, they also will
become invalid. So before applying a DDL operation on any object
better find the it's references from DBA_dependencies and
recompile them after the DDL operation.
Regards,
G. Rajakumar.

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    I've been curious enough to dig around through most of my handy references and Oracle's docs and MetaLink and come up mostly empty, although almost 5 years ago Oracle Support said:
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