FM for BOM levels

Question:
Hi All,
I am doing one report to display the cost estimate of a material. the report shud display the cost of all the BOM materials involved in the parent material which is entered in selection screen. is there any FM which could give the levels numbers and materials involved in the manufacture of single material.
this report is similar to transaction CK13N which will the cost estimate but we need to drill down in that .My report shud display all the materials and the costs along with the BOM level.
thanks ,
kiran.
Answer:
K_UNITCOSTING_MASSDATA_SELECT
CS_BOM_EXPL_MAT_V2

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