ITR Form for filling of income from commission

What  type  of commission ?. 

1. Commission income can be of two types 
i) Where your commission income is your main source and you do that as your profession. Like Insurance commission, commission on the sale of a product, etc. This type of commission is taxed under the head PGBP. 
ii) Another way of commission is earned based on your incidental activity. This is not your main source of income and in other words to say this type of commission in most of the cases will be on a frequent basis. Director awarded a commission on pledging his personal property for procuring a loan for the company. This type of commission will be taxable under the head Income from other sources. 
2. In (i) case ITR - 3 or ITR -4 can be used whereas in case (ii) ITR -1 or ITR -2 can be used for filing a return. 
Please correct me if the above interpretation has an alternative view. 

1. That would very much be considered as professional income and will be taxed under PGBP.