Authorization in T-Code FB50

Question: Dear Expert,

I create 2 roles Officer & Clerk with Clerk only can park documents.
Now, in Transaction code FB50 which have both park and post together, how can I separate the autorization that users have role clerk only can choose park button and can not choose post button.

Thank you

Answer:
Park is activity 77 if the user has 01 then they can post, the user MUST only have 77
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