Problem Creating SLA record for custom entity

Hi everybody when i try to create SLA just for a specific custom entitiy the field "applicable from" which should show all datetime fields on the entitiy only shows  yes\no options, and when i  save i got error "Attribute 'applicablefrom' cannot be NULL".  it's for a specific entity while other entities (including custom) works fine

thank in advence.

Tal

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