The leave to amend should be refused I Where the amendment is not necessary for the purpose of deter...........

The leave to amend should be refused:

I. Where the amendment is not necessary for the purpose of determining the real questions in controversy between the parties

II. When the plaintiff’s suit would be wholly displaced by the proposed amendment

III. Where the effect of the amendment would be to take away from the defendant a legal right which has accrued to him by lapse of time

IV. Where the demand would introduce a totally different, new and inconsistent case, and the application is made at a late stage of the proceeding