Re: Add new components to BOM

>The table structure looks fine, but this is not correct.  It should  
>not be empty.
>You should also check your units of measure.  If they're missing, it  
>can cause problems.
>Some steps to take:
>...

Nathan,

I followed the steps that you suggested and I saw that  the problem really is in my database. I created another installation of GW 1.6.002 and pERP svn 3826 with no data. I made the tests with inventory and it worked fine, but when I restored my dababase, it doesn't worked again, with the same blank screen, but now the apache log showed this:
[Wed Jul 29 14:25:42 2009] [error] [client 127.0.0.1] PHP Warning:  require_once(/usr/share/egroupware/workflow/inc/class.workflow_instance.inc.php) [function.require-once]: failed to open stream: No such fileor directory in /usr/share/egroupware/perp_manufacturing/inc/class.bo_perp_workflow.inc.php on line 15, referer: http://127.0.0.1/egroupware/index.php?menuaction=perp_inventory.ui_perp_stock.stock_edit&new=1&popup=
[Wed Jul 29 14:25:42 2009] [error] [client 127.0.0.1] PHP Fatal error:  require_once() [function.require]: Failed opening required '/usr/share/egroupware/workflow/inc/class.workflow_instance.inc.php' (include_path='/usr/share/egroupware/egw-pear:.:/usr/share/pear') in /usr/share/egroupware/perp_manufacturing/inc/class.bo_perp_workflow.inc.php on line 15, referer: http://127.0.0.1/egroupware/index.php?menuaction=perp_inventory.ui_perp_stock.stock_edit&new=1&popup=

It not made sense for me.
Then I uninstall and reinstall perp_inventory on setup (for clean all inventory tables) and after this, recreated a stock category, an inventory location and tried to create a stock item. Not worked, blank screen and same above error!
My DB has many current informations of all the GW apps and perp ledger, ap, ar, and old information in inventory.
Do you have idea about what tables can be related to this problem?
My idea is erase the entries of this tables and test. Is there a better way?

Thanks