Cannot read the preceding sales document items.

Dear Gurus,

i am trying to make a cash sales order with the following schedule line configurations.

schedule line YP -

relevant for delivery.

mvmnt type 601

availability check marked

req./ assembly marked.

but when i save sales order i receive the errror "cannot read the preceding sales document items."

and when i press enter i get the following details.

Item 000010 does not exist

Message no. V1331

Diagnosis

You have entered an order item that doesn't exist.

Procedure

Check the items in the relevant order and only enter those items which have already been saved.

appreciate your helps......

Regards,

Mehmood