Hi Phong,
You need to create an additional storage location in each of the plants :
Plant 1 - Storage Location 5 - Physically present in Plant 2
Plant 2 - Storage Location 5 - Physically present in Plant 1
When you make this config the stock ownership will still remain with Plant 1 when Stock is lying in storage location 5 in Plant 2 and vice versa.
You need to be careful with this in terms of audit requirements especially true when plants are in different storage company codes. The physical area may need to be marked in the warehouse to identify the storage location and the stock should be kept totally separate from other plant stock even for same material. To move stock between storage location you can use movement type 311 in MB1B.
To move stock between plants
say for example the stock in Storage location 5 of plant 1 (physically present in Plant 2) to Say Storage Location 3 of Plant 2.
You should use Intercompany STO if plants are in different company codes and Intracompany STO if they are in same company code.
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Regards,
Amit