DataSource cannot be updated in an InfoCube.

Hi,

I am new to SAP. Act, i created generic data source over VBAK and VBAP including the fields:

VKORG, AMTBL, BSTNK, VBELN, MATNR, MATWA, ARKTX, KWMENG, LSMENG, KBMENG, KLMENG, VRKME, MEINS & CMWAE.

I transferred the data source in BI side and make a new Infosource and infocube. I made 2 Infosources for AMTBL and ARKTX.

And the rest of the fields are as follows:

0salesorg, AMTBL, 0doc_num, 0doc_number, 0material, 0mat_entrd, arktx, 0cml_or_qty, 0reqdel_qty, 0cml_cf_qty, 0cml_cd_qty, 0sales_unit, 0base_uom & 0doc_currcy.

After making transformations & mapping, when i made DTP, on activating the DTP it gives me error as:

DataSource ZPRACTISE_GDS ECDCLNT230 cannot be updated in an InfoCube

Can anyone please tell me how can i solve this error??

Roma