@api.depends("product_tmpl_id")

def _computeBOMLine(self):

for record in self:

bom_lines = record.product_tmpl_id.bom_ids.mapped("bom_line_ids").filtered(lambda x: record.id in x.bom_product_template_attribute_value_ids.ids)

if any(bom_lines):

record.computed_bom_line_id = bom_lines[0].id

else:

record.computed_bom_line_id = False

computed_bom_line_id = fields.Many2one("mrp.bom.line",compute="_computeBOMLine", store=True)

Compute method is not getting called, unless I remove store attribute nothing happens.