Once you have the record variable you can see the keys using the C/AL Symbol Menu...
1) Press F5 in the code editor
2) Select you variable in the left hand section
3) Select "Keys" in the middle section
4) You have you list of keys displayed in the right hand section
Answers
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1) Press F5 in the code editor
2) Select you variable in the left hand section
3) Select "Keys" in the middle section
4) You have you list of keys displayed in the right hand section