Useful SAP Parameters

Parameter ID is the SAP term that refers to setting a default value so that a particular field is automatically filled in for you. When the default value is filled in, you can still override it for a particular document or query. SAP does NOT provide Parameter IDs for all fields.

To use a Parameter, Go to SU3 (Own User Profile), then click on the Parameters Tab.
Here, maintain the parameters that you would like to use along with the values that you would like to default.
An example of this would be Parameter EKO (Purchasing Org). When you input Parameter EKO with value 1000, this means that whenever you enter a screen which contains Purchasing Org. field, value 1000 will automatically be defaulted for you. However, you are still able to overwrite it if you want to.

To find if a field contains a Parameter ID, click on a field --> F1 --> Technical Information. Then search if there is a Parameter ID.
Table that stores Parameter IDs is TPARA and it is possible to create custom parameter IDs that are not already available.

Useful Parameters are as below.
BFC - PR Release Code
BUK - Company Code
CAC - Controlling Area
EKG - Purchasing Group
EKO - Purchasing Org
EVO - Default Values for Buyer
FAB - Purchase Order Release Code
FIK - FM Area
FWS - Currency Unit
GJR - Fiscal Year
GR8 - Default File Transfer Download Path
KAR - Class Type
KGK - Vendor Account Group
KPL - Chart of Accounts
LAG - Storage Location
WRK - Plant
NDR = X To Default Print checked in Inventory for GR/GI slip
IVAMOUNTADJUST = X To automatically calculate Invoice Values
EFB - Buyer Default Values (Config via OMET)
ME_USE_GRID - To be able to view reports in Grid (e.g. in ME1L)

For a more comprehensive list, you could search for it in SAP by going to:
SM30 --> TPARA Table --> Display --> Application Hierarchy

If a field that you require defaulting does not have a Parameter ID, you could actually perform a few simple steps to create it.
1) T-code SM30 --> Enter Table TPARA --> Maintain
2) Enter a Parameter ID and Enter, then include a Text to describe this Parameter
3) Save
4) Assign this Parameter ID to a Data Element via SE11 --> Further Characteristics.