The SOS Applicability drop-down is available for selection only when the “Part Type” is selected as “Component” in the part administration component and the “SOS Program” is selected as “Applicable” in the “Common Masters component. This combo is also enabled when the “Part Type” is selected as “Other than Component” and the “Part Classification is set as “Repairable” in part administration component. SOS Applicability”  should not be enabled in this page for all other conditions other the above mentioned.