SAP B1 Fixed Asset Invoice return & "Sales Item" checkbox remove

[Mohamed_Adel]

Hi everybody!

I have an 2 issues I would like your help with. First I have an invoice that was entered by mistake with Fixed asset row. According to SAP Note 3321442 you cannot create a credit memo or return for this type of invoices. The solution proposed is to cancel the invoice. But it in my country it is illegal to cancel  or void an issued invoice, only  returns are allowed. 

The second issues I have around 2000 fixed assets. for some reason (previously done) they were uploaded by the "Sales Item" check box checked. so they appear in the list of items you are allowed to sell. I want to mass upload this particular check box to '0' to be unchecked. I was able to do this in the item master data but I cannot do it in the fixed assets as it keeps asking for full details of the assets (capitalization date, historical cost, etc...). any advise will be much  appreciated