I add below lookupfield into UI xml file but it is always deleted automatically after save.
<lookupField datasource="ccsWoDs" property="wo" optionsDatasource="ccLbmastsDs"/>
<fieldGroup id="fieldGroup"
datasource="ccsWoDs">
<column width="250px">
<field property="wodate"/>
<field property="dpment"/>
<field property="shf"/>
<field property="begintime"/>
<field property="endtime"/>
<field property="hrs"/>
<field property="item"/>
<field property="mach"/>
<field property="stdp"/>
<field property="staff"/>
<field property="nonccs"/>
<field property="locn"/>
</column>
<column width="250px">
<lookupField datasource="ccsWoDs" property="wo" optionsDatasource="ccLbmastsDs"/>
<field property="leftqty"/>
<field property="qaqty"/>
<field property="qauom"/>
<field property="totcart"/>
<field property="totpcs"/>
<field property="phycart"/>
<field property="stkctqty"/>
<field property="qayn"/>
<field property="stkyn"/>
<field property="jdeyn"/>
</column>
</fieldGroup>