This problem is to be solved according to sap note 11842 - Screen for internal area is too large , there are two possibilities : either the batch input data is incorrect (too many data in one screen because of program's bug), or parameter bdc_job_size is too small (increase it and restart the server(s) to take it into account). So, please first make sure you did it as explained in the SAP note, then contact SAP support to get some help.
That said, I'm surprised that you didn't tell us what you exactly did to solve before asking the question in the forum (i.e. that you have found the note 11842 by searching, that you have changed the parameter, which size, did you restart), that would save us time and energy to answer you.