Allow New Entries Permission

Can anyone give the specifics, or point me to documentation that does, of the Allow New Entries permission. (Version is 7.1) It seems to exist only when using a Custom Profile. How does it differ from the right to modify an index entry? Is it needed in addition to other rights?

Workflow has thrown errors that a user without this right cannot change an index entry despite having the right to read search and modify given by an Index Profile where Add New Entries is not even an option.

Any and all clues appreciated,

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Dear Steve,
"Allow new entries" is the right to add a completly new entry for this field into the file cabinet while "Modifiy" basically means, that the user can change the index entry for an already stored document. 
I hope this explains it better.

Tobias,

Thank you for that info. The real question is this. Most of the users have been assigned to Index Profiles to provide very granular control over who can see and modify certain documents. 'Add New Entries' is not an option in an Index Profile, so insufficient rights errors occur during workflows for these users. It seems that a Custom Profile must be created, the 'Add New Entries' permission given, and then this profile assigned to the users along with the index profiles. And that this is by design. Have I got that right?

Thanks again,

Is it accurate to say:

A user cannot edit index data through the use of an Index Value Profile alone.  In order to edit index data a user must have the right Allow new entries. This right is only available when a Custom Profile is used.  

My tests show that if a user has all rights under an Index Value Profile, they cannot edit index data. The error message refers to the right Allow new entries.  However, if I create a Custom Profile with no rights at all except for Allow new entries (for every field), that same user can then edit index data (edit then save) - when that user is added to both profile types.

Very coherent and organized!  This is correct.