RE: Old numbers sequence are not going from PR list even from everywhere
So you are saying that the PO and PR that have the new number, don't show up in the corresponding forms, unless you filter by the exact number? I'm quite sure that's not the case, since the filtering filters the records that would be shown in the grid also without the filter.
But, the default sorting on the form might not show the latest PR / PO when you open the form. I think the sorting is based on the id of PR / PO. If you sort by creation date you would see the new ones.
For example if in 2020 you used format B-001, B-002, B-003 and this year you use format A-001, A-002, A-003, the latest records will actually appear before the last year's records, based on the default sorting:
A-001 (first PO of 2021 will be shown in the top)
A-002 second PO of 2021
A-003 third PO of 2012
B-001 first PO of 2020
B-002 second PO of 2020
B-003 third PO of 2020