I have questions on VBAK-VDATU (Request Delivery Date..)

Hi, I found it is strange...

When i using VBAK to check an SO document, i found there is a fields called 'VDATU' whose description is 'Delivery Request Date'.

Then i want to goto VA03 to locate where this field is located on the front-end screen.

Obviously that on the Sales Tab, there existe an 'Delivery Request Date' on the screen. I guess this must be the same as VBAK-VDATU...

But when i press F1 to check its technical information but found that the field name becomes to RV45A-KETDAT???

Even the fields name is not the same???

May i know whether these 2 field is the same field?

If it is, then why the name displayed in different name???

Thanks!!!!

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Hoo Laa