Invoice No field on Manual Supplier Invoice for auto numbering

Hi community,

I defined a new invoice type and series ID for supplier. Then I assigned the new invoice type to supplier as default invoice type for manual invoice. When I create a new invoice for the supplier, invoice type and series ID are populated from supplier basic data however invoice no field is not read only as expected. See my steps below

1. Define a new series ID

2. Select series ID and click invoice number series button. Enter valid from, start value, end value and next value in detail window.

3. Define a new supplier invoice type and select previously created invoice series ID for definite invoice series ID.

4. Go to supplier master and change default invoice type for Manual to newly created invoice type. 

5. Create a new supplier invoice. See that invoice type and series ID info is populated from supplier master. However, invoice no field is not read only as expected. If you manually assign the invoice type for any supplier then the field is read only.

Can someone test in reference environment please? 

Thanks