Hello Sacha
You must check are there any other requirements for your item test3.
And this depends on many other standard planning parameters.
You can create third line in formuła with test3 without plan group and priority an quantity 0,01
| Item | Quantity | Per series | unit | plan group | priority |
| test4 | 1 | 1 | kg | 52 | 1 |
| test3 | 1 | kg | 52 | 2 | |
| test3 | 0,01 | 1 | kg | ||
after plan you check third line create planned order or used your material form inventory.
You are planned order for finish goods on 150 and have free 100 item4 and 50 item3 then expect result for me (if you have 3 lines in formula)
1 line 100kg (on hand) test4
3 line 1,5 kg (on hand) test3
2 line 48,5 kg (on hand) test3
1line 1,5 kg (purchase order) test4 (because you have no free substitution)
Best regards