Invalid User Name and Password after changing the sa Password

Hi All,

I've Installed SAP 9.0 PL 05 ,while installing I've given database details as

User Name : sa

Password : abcd

Installation got success and I could able to log in to listed companies.

But, after I've changed sa user Password in SQL Server

i.e

User Name : sa

Password : xyz

Now , companies are not listed , then I had reset the password in (SAP Business One Service Manager - > Configure Security - > SLD)

When I check after this companies are listing, But

If I try to login with my regular user it is saying

Invalid User Name and Password

for testing purpose I've reset the earlier password for sa and tried., then it is working fine.

does the sa password affecting anywhere?

how can I change my sa password and use normally?

any help or knowledge would be very helpful

Thanks & Regards

M G