Invoices being posted into 10806 instead of 10807

Hi,
 
I am a complete novice with this AS400 / System 21.
 
We run an old version v3.5.1 (I think - not sure where to find that info
out!) and we've run Period End for July, this being Cash/Sales/Stock. We
have an issue where invoices are still being posted into 10806 rather
than the current period (10807). What do I need to check to ensure that
the period end routines worked properly?
 
I've check SLCOMPNY and it shows the open period to be 10807, Stock
shows up posting of incoming stock into 10807 but we are perpexed to why
this is happening, our support people are investigating but could
really do with finding an answer asap!
 
Thanks for all help given in advance,
Regards,
Carl.

This email is sent for and on behalf of Brecrest Limited.
Brecrest Ltd is a limited company registered in England 
and Wales under registered number 1168494 whose registered 
office address is at Unit 6, Warth Industrial Park, 
Warth Road, Bury, Lancashire, BL9 9NB. 
Tel: +44 (0) 161 763 8550 Fax: +44 (0) 161 763 8551.
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