Pricing[access sequence]

dear all,

i would request you all to help me out of the problem that i am facing i.e. in the "Access sequence" when i am trying to copy an access sequence, i am getting a daoulag box asking me weather i got to "COPY ALL" or "ONLY COPY ENTER" and then i have selected "copy all" then i have got an error and the error is "Access type Cis not defined for key fields".

what i have to do to retify this error.

Regards,

sushmitha