Change attribute requirement level at runtime

http://ronaldlemmen.blogspot.com/2007/07/change-requirement-level-at-runtime.html

// Set field to not required
crmForm.SetFieldReqLevel("fieldname", 0);

// Set field to business required
crmForm.SetFieldReqLevel("fieldname", 1);

// Set field to business recommended
crmForm.SetFieldReqLevel("fieldname", 2);