Restrict the Drop down list in Additional Data B in sales order based on Doc type+ Dch Chanel

Hi All,

My client requirement is when user is creating a sales order, status fields should be restricted based on

Sales doc type + Dis channel system should show only some order status list in the drop down list in sales order-->Header-->Additional Tab B shown below.

e.g. when sales order is created with sale doc type(OR )+ Dis Chan(10) --> only 10,21,40

sales doc type (ZOR) + Dis chan(20)--> only 20,30

Is there anyway where we can achieve this using configuration? if this is only possible using user exit, please advise the relevant user exit for this.

Searched the SCN Forum and Google but I could not find the relevant post..

Thanks in advance for your time.