Inventory - The value of your inventory may not be less than Zero

I am using  MYOB AccountingRight Premier AU 2022.3.0 Build: 2022.3.24.6313 (Company ID 37).

I have come across a stock item with current Value "N/A" and Average cost "N/A".

How could i replace N/A with $ value (which is actual cost and current value). Tried using Ädjust Inventory" but I end up getting an error message. "The value of your inventory may not be less than Zero"

This erro has also prevented us from converting PO to a Bill.

This issue has been reported in the past and it was suggested by Steven a script had to be run over company files that are showing N/A inventory value.  Anyone know whom should be contacted to run the script and rectify the error which is causing a lot of inconveience to our business. 

Your help will be appreciated. Thank you