Meaning of internal accounting

[FangFang]

Business English Lesson, Advanced Level

ESL/EFL Test #153 "Cost Accounting", question 2

This is an ......... accounting system, rather than one for outside reporting.

(a) inner
(b) inside
(c) interior
(d) internal

Business English Lesson, Advanced Level

ESL/EFL Test #153 "Cost Accounting", answer 2

This is an internal accounting system, rather than one for outside reporting.

Correct answer: (d) internal

Your answer was: incorrect
This is an inner accounting system, rather than one for outside reporting.
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Hi,
I have two questions ,
1) Please tell me why I can' t use "inner" here
2) Would you like to tell me their antonyms of "inner" ,"internal" ?

Thanks a lot

[Yankee]

[Mister Micawber]

.
No, Yankee covered it nicely. Internal accounting, internal auditing, external auditing-- these are collocations/phrases used in the financial field.
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Native English teacher at Mister Micawber's