What field in the field list should I pick to display only the POs (without the date)?

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Question

There is a field called POandDate, which I don't want because it displays the date of the job, and I only want the PO. 
 There is another field called PurchaseOrderNumbers, but it does not help either because it displays all of the POs in the invoice in each row (not one PO per row). 
 What is the field to display only one PO per row, without any date? 
 
 It would also help to have some guide for the field list, I find it very difficult to find what I need. 
 Thank you in advance!

Eugene Kuchynski · Accepted Answer

Hello, Margarita, 
 This is Job.PONumber 
 Margarita Pavón-Mestras said: It would also help to have some guide for the field list, I find it very difficult to find what I need. 
 
 Well, if you know that each invoice row is linked with a job, then you can access any job field from any invoice row. As for field list, they are self-explanatory I think - repeating those fields which you see in the job editing form. 
 Hope this helps.

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What field in the field list should I pick to display only the POs (without the date)?