Difference between Posting key and Field status group

What is the difference among Account group, Posting key and Field status group in terms field status?

Account group defines:

a. lenght of gl account number
b. no. ranges of the gl account numbers
c. field status of the GL account master data in the company code segment.(which fields to appear when you create a gl account) (to control...double click on your GL account group in Screen transaction code OBD4)

Posting key defines:

a. whether the line item is a debit or credit
b. to which type of account the amount should be posted to(ex: when you use posting key 40, you will be able to post to gl accounts. When you use Posting key 01, you will be only able to post to customer account.
c. document screen layout during posting of a document. (which feilds to appear in a document...double click on the posting key and select field status and make the entries as required /optional etc)

Field status group defines:

Document screen layout during posting of a document. (which feilds to appear in a document...double click on the field status group and select fields and make the entries as required /optional etc)

LOGIC: you assign field status variant to the company code, FSV is a bundle of field status groups.

ex: in FSG G001 you have made the text as required entry...you assigned the field status group g001 to cash account..so when you use cash account and try to post a document it will definitely prompt you to enter the text (text made as required.)

Both FSG and PK control the same feilds in a document.There is no dominance between FSG and Posting keys..but we should know the allowed combinations....

If text is made required in PK and suppressed in FSG..the system will issue a error msg..Rules for PK...and FSG....is set incorrectli for SGTXT field.

Permissable combinations:

Pk R/S O/S R/o R S O

FSG S/R S/O o/r R S O

Result e SD RD NP NP NP


R= required
s= suppressed
e=error
SD= Suppressed dominates
Rd= required dominates
np=no problem.