issue with EmployeeId and Account ID while creating PARTY in Opportunity BO ABSL

Dear All,

We have some logic from which we determine the party and add the same in Opportunity with below code in before save

if (Supplier.IsSet()) 
{														    SalesTeamTmpl.Clear();														SalesTeamTmpl.PartyKey.PartyID.content	= Supplier.InternalID;														SalesTeamTmpl.RoleCode	= "ZSUPP";														this.Party.Create(SalesTeamTmpl);												}

Now the issue is We have an Employee who has ID 638 and an Account which also has ID 638.

I checked that Employee's Business partner number is also 638 ( checked from Identification node of Employee BO)

However , How can I make sure that by passing 638 i would add an Account and not an employee?

Regards

Dhruvin