MYSQL - Cannot able to drop a column -

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I am using MYSQL 5.1. When I try to drop a column in a table, it throws the following error MATERIAL_OUTWARD_ID is a foreign key.

query: 

  changes table `tispa`. Customer_invoice drop `MATERIAL_OUTWARD_ID`

Error: 

  Rename in name ' \ Tispa \ # sql-78_8 'to \ Tispa \ customer_invoice '(errno: 150)

Try to leave the foreign key Do you? 

  Changing table ... drop main foreign content _OUTWARD_ID

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