vision:baan v
I create table baandb.ttdpur446 by copying from baandb.ttdpur401 then delete table ttdpur446's indexes and other fields.after i covert to runtime data dictionary in package td , tables baandb.ttdpur446 - baandb.ttdpur446,i can't create a new purchase order in purchaser module ,note" fatal 513 (data dictionary not found) on baandb.ttdpur400 ".why ?how can i recover the baan v system to create a new purchase order

I am not sure to have understand what you mean, but I have an advise to you: NEVER do convert to runtime DD with limits of tables. If the table have references to other tables that are not converted, you are in a lot of mess. Convert to rtdd is designed to convert only table that have been modified, so there is no use (and I never understand why Baan allows it) to do limitations.
Try to do the Create runtime DD instead (again, without limits). This can be a solution of your problem.