SAP SD Storage Location Determination

Referreing to the Question asked by Deepak
Mat 'ABC' is stored in plant 'PLA' in two different storage locations 'STR1' and 'STR2'. On creating a SO which storage location, will it pick and why??

Hi Deepak,
Let me explain you first how the storage location is determined

Storage location is determined at the delivery document by storage location rules viz MALA, RETA or MARE
The most commonly used one is MALA.
One rule is defined against a Delivery type (ref: check in TC : 0VLK - Delivery type LF)
MALA is determined as below:
STORAGE LOCATION = SHIPPING POINT + PLANT + STORAGE CONDITION
RETA = PLANT + SITUATION + STORAGE CONDITION
MARE = MALA then RETA (First MALA will be applicable failing to find this rule, system will trace for RETA)
Check which rule is applied to the delivery type.
So if MALA is used for storage location determination then based on the parameters defined for shipping point, plant and storage condition system will pick the storage location.
We set Storage location determination under Shipping -->Picking-->Determine Picking Location-->Assign Picking Locations
But COPY CONTROL also plays its role in copying the storage location in the delivery document if it is created w.r.t. the SO. (Ref: TC: VTLA under Item data one routine is defined viz. “101”)
Please have look at the below portion of “Routine 101”
IF CVBAP-LGORT NE SPACE. (LGORT = Storage location)
LIPS-LGORT = CVBAP-LGORT.
ENDIF
IF NOT CVBAP-CHARG IS INITIAL.
LIPS-CHARG = CVBAP-CHARG.
ENDIF.
Coming back to your question, above portion of SAP standard routine 101, explains us if in a SO, storage location is blank, storage location will be picked determining the rule e.g. MALA, and if SO has a value for storage location then LIPS-LGORT = CVBAP-LGORT. (LIPS is delivery at item level and VBAP is SO at item level)
* SO = Sales Order