Method A
A.1 Permission 1 path:Control Panel > System Admin > Manage User > Configure Role Permission > Customer > General Customer Module Permissions > Permission to create Credit Memo by Trade In Items  Image Modified
Note:
Disable the GLcode part on Trade In Page (Customer Credit Memo page) - apply for operation staff who cannot enter the accounting part.
A.2 Permission 2 path:
Control Panel > System Admin > Manage User > Configure Role Permission > Customer > Credit Memo by Branch
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Method B:Customer > Credit Memo > Create > Permission icon on top right corner
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