Any set of rules how to fill SD Table TVWA GoodsReceivingHours?

[Christian_83]

Dear Community,

I just checked the goods receiving hours in our customer data and found that there is a huge variation in how my colleagues filled the fields.

1st question:
Are there any rules defined by SAP on how to fill these fields? I couldn´t find anything within the helping sections.

2nd question:
I have an excel export for the fieds. Is there a possibility to change the times in the excel sheet and to import it back to SAP?

Thanks in advanced!😍
Christian

Here is an example how the monday is used in our customer data: 
H: WAMOAB1
I: WAMOBI1
J: WAMOAB2
K: WAMOBI2