want to change asset number in MB22

hello experts.

there is a requirement regarding MM.

want to change an asset number from tcode MB22 after creating a reservation from tcode MB21.

example.

while creating a reservation from a tcode MB21, user has entered an asset number and add some items while creating a reservation. Now when user enter a tcode MB22 to make changes to a previously created reservation. There is a field of asset number which cannot be change but there is a requirement to change that asset number in this tcode MB22.

Is there any authorization object or any other solution to make such type of changes?

As this need to be set for the transaction MB22.

If so then let me know the solution as soon as possible, as its very important.