In FV60, while simulate giving error as Field & is not an input field

fv60-error.pngIn /n/opt/vim_va2 tcode, i provided the document number and executed and it redirected to FV60 tcode and filled all the details which are relevant and when i click on simulate it is giving me an error as below

Field AGGL_ITEM-AUFNR is not an input field
The error is same for BUKRS,HKONT,KOSTL,NPLNR,PRCTR,PROJK,SGTXT,SHKZG,MWSKZ,TXJCD .

It would be very helpful if anyone throws some light on this issue.

Thanks in Advance