TC_CRE_DMR_022_LCP valueof applyed on omit

invalid argument to valueof: omit is not a value
	...
	at OneM2M_Testcases_CSE_Release_3.ttcn:1635:7:1635:109
	at OneM2M_Testcases_CSE_Release_3.ttcn:1632:72:1642:7