Assume T1 and T2 as tenants under a tenant group. S1 and S2 as stores under tenants T1 and T2 respectively. P1 and P2 as partners under tenants T1 and T2 respectively.
T1
-S1 (P1)
T2
-S2(P2)
If you need to transfer items from Store 1 (S1) to Store 2(S2) ,
create P1 (~S2) at T1/S1
create P2(~S1) at T2/S2
link P2 to T1/S1/P1
link P1 to T2/S2/P2
Create Sales Receipt at S1 for P1.
Automatically a GRN will be drafted at S2 against P2