Data Loading Error

Hi all,

I am loading data for Production planning and controlling module.I have already  loaded  data to DSO 0PP_DS01 from datasource  2LIS_04_P_MATNR. datas are coming properly in DSO..

But  while executing DTP from DSO to Cube ie, loading data from DSO 0PP_DS01 of datasource 2LIS_04_P_MATNR to cube 0pp_C10 there are  several  errors  coming and they are

1. data package processing is terminated (Message no. RSBK229) 
2. SQL Server Native Client 10.0][SQL Server]Operand data type nvarchar is invalid for sum operator.( RS_EXCEPTION000)
3. Error while extracting from source 0PP_DS01 (type Datastore)( RSBK242)
4. Data package 1  Status 'Processed with Errors(RSBK257)

I have already deleted datas from from DSO and reloaded it again in the Cube but even this is not working out. Same errors are coming. Please suggest me what else can be done for solving the errors.

Regards,

Nilay