Parameter value is out of range in Entity Framework (DB first)

Question

In SQL, I have a decimal column:

Which I've mapped to an entity property in my edmx:

Frustratingly, I get an error when trying to save a value that does lie in this range:

Parameter value '164.2640000000' is out of range

Does anyone have any ideas why this is happening? The answers in this similar question are not much help, as I'm not using code first.

Answer 1

Oddly, doing another 'update from database' solved this issue.