DP90 for T&M billing

Dear Experts,

While running DP90 one new material is determined from DIP profile which already exists in ODP1

My doubt is what makes the system to determine a material into DP90.

Actually in my sale order i used D314 material but D404 is determined into DP90.

Even i maintained both materials in ODP1-material determination.i also maintained Cost element and activity type to these materials.

I want the system to determine D314 not D404.

Note:i am using SAP professional Services best practices to implement the SAP.My client is related to service industry.

Help me in this,Thanks in advance.