How to identify Header, Item and Schedule item level data sources?

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Hi all of you,

I was learning data source enhancement by referring to some notes wherein a field Profit Center is being appended to the data source 2LIS_11_VAITM. At one point the author says that,

"Now the next point is, how many communication structures do we have in 2LIS_11_VAITM data source? From the maintenance hyperlink in the communication structure I can see that there are 5 communication structures. They are:

a. MCVBAK

b. MCVBAP

c. MCVBKD

d. MCVBUK

e. MCVBUP

So to which communication structure should I append the field? And I know that Profit Center is Item Level Information. <i><b>And I know that MCVBAK is an item level communication structure. So I will append the Profit center field to the MCVBAK communication structure."</b></i>

Now my doubt is how do we identify that a particular field belongs to Header level, Item level or Schedule level?

How do I identify that a particular communication structure belongs to Header level, Item level or Schedule level?

Please clarify my doubt.

Thank you.

TR.