What is the required date format used to import accounting transactions to Accounting Hub Cloud?

Given the business use case:
'Insurances for Homes' company provides home insurance services. They have an in-house built system that processes insurance payments received from customers. The end result of the process consists of a listing of individual journal entries in a spreadsheet. They have requirements for getting all Journal entries in a secure and auditable repository. Access will be limited to selective staff members. Additionally, the company need to be able to report and view the entries using advanced reporting and analytical tools for segmenting, viewing and understanding data in the journal entries.
The line information may contain more than one line for the same header.
When uploading transactions, which is a way to differentiate each Journalline?

Which is an alternate way to implement a mappingset rule?

You have been assigned to troubleshoot a Create Accounting error.
What is the first step you need to take to use the diagnostics framework features?

What is a user job role data context assignment?