Incremental data load error .. ODI to Planning

Hi,

I have been trying to load data in HCP cube using ODI, and getting following error message when loading incremental data, however there is no issue in loading metadata or data which does not use LINEITEM flag.

Error file :

Budget Item,Data Load Cube Name,Option Start Date,Option End Date,Option Value,Maximum Value,Options,Point-of-View,Error_Reason

<LINEITEM("Element Changes")>,HCP,12-11-2015,,320.67,,No,BegBalance,Seeded Base,Budget,No Year,Vacancy,Unspecified Entity,Default Position,AE_1236,Cannot load dimension member, error message is: com.hyperion.planning.HspRuntimeException: At least one unique identifier must be specified for each member defined in Data Load Dimension Parent. Specify a unique identifier member for Element Changes.