MDS throwing arithmetic overflow error

We are using SQL server 2012 MDS - we have been getting arithmetic overflow error whenever someone tries to updae/add a new record to any entity. We use auto-generated code in most cases.

This is the exact error message -

Arithmetic overflow error converting IDENTITY to data type int.

How do we resolve this error in MDS? We are using MDS in-built functionality, so wondering what went wrong.

Thanks,

Sonal