fix: Generic Message in previous doc validation for buying and selling

[marination]

Issue:

Make message to Validate Previous Document generic for Sales and Purchase
Sales

Purchase

[marination]

@Mergifyio backport version-12-hotfix

[mergify]

Command backport version-12-hotfix: pending

Waiting for the pull request to get merged

[Anurag810]

Travis Failing: Need to set precision in test.

[mergify]

Command backport version-12-hotfix: failure

No backport have been created

• Backport to branch version-12-hotfix failed

Cherry-pick of 5f299a0 has failed:

On branch mergify/bp/version-12-hotfix/pr-22546
Your branch is up to date with 'origin/version-12-hotfix'.

You are currently cherry-picking commit 5f299a08bd.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   erpnext/utilities/transaction_base.py

no changes added to commit (use "git add" and/or "git commit -a")